prochlorperazine (Rx)

Severe Nausea & Vomiting

PO: Immediate-release, 5-10 mg q6-8hr; extended-release, 10 mg q12hr or 15 mg every morning

Suppository: 25 mg q12hr

IM: 5-10 mg q3-4hr; not to exceed 40 mg/day

IV: 2.5-10 mg q3-4hr; not to exceed 10 mg/dose or 40 mg/day

Severe Intraoperative Nausea & Vomiting

Prophylaxis

IM: 5-10 mg administered 1-2 hours before induction of anesthesia; may be repeated once 30 minutes after initial dose

IV: 5-10 mg administered 15-30 minutes before induction of anesthesia, repeated once before procedure if desired, or 20 mg/L administered 15-30 minutes before induction; not to exceed 30 mg/day

Psychosis

5-10 mg PO q6-8hr; slowly titrate dose q2-3days; not to exceed 150 mg/day

10-20 mg IM q2-4hr to gain control; 3-4 doses rarely needed

Psychotic Disorder

<2 years: Not recommended

2-6 years: 2.5 mg PO/PR q8-12hr initially; not to exceed 20 mg/day; not to exceed 10 mg on the first day

6-12 years: 2.5 mg PO/PR q8-12hr initially; not to exceed 25 mg/day; not to exceed 10 mg on the first day

Severe Nausea & Vomiting

<2 years: Not recommended

≥2 years (9-13 kg): 2.5 mg PO daily or q12hr; not to exceed 7.5 mg/day  

≥2 years (13.1-18 kg): 2.5 mg PO q8-12hr; not to exceed 10 mg/day

≥2 years (18.1-37 kg): 2.5 mg PO q8hr or 5 mg PO q12hr; not to exceed 15 mg/day

Not drug of choice in elderly, because of extrapyramidal symptoms

Nonpsychotic Dementia Behavior (Off-label)

Lower initial dose and adjust gradually; 2.5-5 mg/day PO; dosing interval may be increased to q8-12hr PRN; not to exceed 75 mg/day

Contraindicated (10)

• amisulpride

  amisulpride, prochlorperazine. Either increases toxicity of the other by Other (see comment). Contraindicated. Comment: Increases risk of neuroleptic malignant syndrome.

• disopyramide

  prochlorperazine and disopyramide both increase QTc interval. Contraindicated.

• ibutilide

  prochlorperazine and ibutilide both increase QTc interval. Contraindicated.

• indapamide

  prochlorperazine and indapamide both increase QTc interval. Contraindicated.

• metrizamide

  prochlorperazine, metrizamide. Mechanism: unknown. Contraindicated. Risk of seizure. D/C phenothiazine 24h before admin. of metrizamide.

• pentamidine

  prochlorperazine and pentamidine both increase QTc interval. Contraindicated.

• pimozide

  prochlorperazine and pimozide both increase QTc interval. Contraindicated.

• procainamide

  prochlorperazine and procainamide both increase QTc interval. Contraindicated.

• quinidine

  prochlorperazine and quinidine both increase QTc interval. Contraindicated.

• sotalol

  prochlorperazine and sotalol both increase QTc interval. Contraindicated.

Serious - Use Alternative (68)

• aminolevulinic acid oral

  aminolevulinic acid oral, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid administering other phototoxic drugs with aminolevulinic acid oral for 24 hr during perioperative period.

• aminolevulinic acid topical

  prochlorperazine increases toxicity of aminolevulinic acid topical by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration of photosensitizing drugs may enhance the phototoxic reaction to photodynamic therapy with aminolevulinic acid.

• amiodarone

  prochlorperazine and amiodarone both increase QTc interval. Avoid or Use Alternate Drug.

• apomorphine

  prochlorperazine decreases effects of apomorphine by pharmacodynamic antagonism. Avoid or Use Alternate Drug.

• arsenic trioxide

  prochlorperazine and arsenic trioxide both increase QTc interval. Avoid or Use Alternate Drug.

• artemether/lumefantrine

  prochlorperazine and artemether/lumefantrine both increase QTc interval. Avoid or Use Alternate Drug.

• benzhydrocodone/acetaminophen

  benzhydrocodone/acetaminophen, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation. Increased risk of hypotension if ability to maintain blood pressure has been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (eg, phenothiazines or general anesthetics).
  
  benzhydrocodone/acetaminophen and prochlorperazine both increase sedation. Avoid or Use Alternate Drug. Limit use to patients for whom alternative treatment options are inadequate

• bromocriptine

  prochlorperazine decreases effects of bromocriptine by pharmacodynamic antagonism. Avoid or Use Alternate Drug.

• buprenorphine subdermal implant

  buprenorphine subdermal implant and prochlorperazine both increase sedation. Avoid or Use Alternate Drug. Limit use to patients for whom alternative treatment options are inadequate

• buprenorphine transdermal

  buprenorphine transdermal and prochlorperazine both increase sedation. Avoid or Use Alternate Drug. Limit use to patients for whom alternative treatment options are inadequate

• cabergoline

  prochlorperazine decreases effects of cabergoline by pharmacodynamic antagonism. Contraindicated.

• calcium/magnesium/potassium/sodium oxybates

  prochlorperazine, calcium/magnesium/potassium/sodium oxybates. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

• chlorpromazine

  chlorpromazine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• clarithromycin

  prochlorperazine and clarithromycin both increase QTc interval. Avoid or Use Alternate Drug.

• degarelix

  degarelix and prochlorperazine both decrease QTc interval. Avoid or Use Alternate Drug.

• dofetilide

  prochlorperazine and dofetilide both increase QTc interval. Avoid or Use Alternate Drug.

• dopamine

  prochlorperazine decreases effects of dopamine by pharmacodynamic antagonism. Contraindicated.

• dosulepin

  prochlorperazine and dosulepin both increase QTc interval. Avoid or Use Alternate Drug.

• dronedarone

  prochlorperazine and dronedarone both increase QTc interval. Avoid or Use Alternate Drug.

• droperidol

  prochlorperazine and droperidol both increase QTc interval. Avoid or Use Alternate Drug.

• epinephrine

  epinephrine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• epinephrine racemic

  epinephrine racemic and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin base

  prochlorperazine and erythromycin base both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  prochlorperazine and erythromycin ethylsuccinate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  prochlorperazine and erythromycin lactobionate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin stearate

  prochlorperazine and erythromycin stearate both increase QTc interval. Avoid or Use Alternate Drug.

• fentanyl

  fentanyl, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fentanyl intranasal

  fentanyl intranasal, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fentanyl transdermal

  fentanyl transdermal, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fentanyl transmucosal

  fentanyl transmucosal, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fluconazole

  prochlorperazine and fluconazole both increase QTc interval. Avoid or Use Alternate Drug.

• fluphenazine

  fluphenazine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• formoterol

  prochlorperazine and formoterol both increase QTc interval. Avoid or Use Alternate Drug.

• haloperidol

  prochlorperazine and haloperidol both increase QTc interval. Avoid or Use Alternate Drug.

• hydrocodone

  hydrocodone, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation. Increased risk of hypotension if ability to maintain blood pressure has been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (eg, phenothiazines or general anesthetics).

• itraconazole

  prochlorperazine and itraconazole both increase QTc interval. Avoid or Use Alternate Drug.

• ketoconazole

  prochlorperazine and ketoconazole both increase QTc interval. Avoid or Use Alternate Drug.

• levodopa

  prochlorperazine decreases effects of levodopa by pharmacodynamic antagonism. Avoid or Use Alternate Drug.

• levodopa inhaled

  prochlorperazine decreases effects of levodopa inhaled by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Phenothiazine/1st generation antipsychotics inhibit dopamine D2 receptors in varying degrees.

• levoketoconazole

  prochlorperazine and levoketoconazole both increase QTc interval. Avoid or Use Alternate Drug.

• lisuride

  prochlorperazine decreases effects of lisuride by pharmacodynamic antagonism. Contraindicated.

• lofepramine

  prochlorperazine and lofepramine both increase QTc interval. Avoid or Use Alternate Drug.

• lumefantrine

  prochlorperazine and lumefantrine both increase QTc interval. Avoid or Use Alternate Drug.

• methyl aminolevulinate

  prochlorperazine, methyl aminolevulinate. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Each drug may increase the photosensitizing effect of the other.

• methyldopa

  prochlorperazine decreases effects of methyldopa by pharmacodynamic antagonism. Contraindicated.

• metoclopramide intranasal

  prochlorperazine, metoclopramide intranasal. Either increases effects of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Avoid use of metoclopramide intranasal or interacting drug, depending on importance of drug to patient.
  
  prochlorperazine increases toxicity of metoclopramide intranasal by pharmacodynamic synergism. Avoid or Use Alternate Drug. Potential for additive effects, including increased frequency and severity of tardive dyskinesia, other extrapyramidal symptoms, and neuroleptic malignant syndrome.

• moxifloxacin

  prochlorperazine and moxifloxacin both increase QTc interval. Avoid or Use Alternate Drug.

• nilotinib

  prochlorperazine and nilotinib both increase QTc interval. Avoid or Use Alternate Drug.

• octreotide

  prochlorperazine and octreotide both increase QTc interval. Avoid or Use Alternate Drug.

• octreotide (Antidote)

  prochlorperazine and octreotide (Antidote) both increase QTc interval. Avoid or Use Alternate Drug.

• olopatadine intranasal

  prochlorperazine and olopatadine intranasal both increase sedation. Avoid or Use Alternate Drug. Coadministration increases risk of CNS depression, which can lead to additive impairment of psychomotor performance and cause daytime impairment.

• perphenazine

  perphenazine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• pramipexole

  prochlorperazine decreases effects of pramipexole by pharmacodynamic antagonism. Contraindicated.

• promazine

  prochlorperazine and promazine both increase QTc interval. Avoid or Use Alternate Drug.

• promethazine

  prochlorperazine and promethazine both increase QTc interval. Avoid or Use Alternate Drug.

• quinidine

  quinidine, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Additive cardiac effects.

• ropinirole

  prochlorperazine decreases effects of ropinirole by pharmacodynamic antagonism. Contraindicated.

• safinamide

  prochlorperazine decreases effects of safinamide by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Dopamine antagonists may decrease safinamide effects and exacerbate Parkinson disease symptoms.

• saquinavir

  saquinavir, prochlorperazine. Either increases toxicity of the other by QTc interval. Avoid or Use Alternate Drug. Increased risk of QT prolongation and cardiac arrhythmias.

• selinexor

  selinexor, prochlorperazine. unspecified interaction mechanism. Avoid or Use Alternate Drug. Patients treated with selinexor may experience neurological toxicities. Avoid taking selinexor with other medications that may cause dizziness or confusion.

• sodium oxybate

  prochlorperazine, sodium oxybate. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

• tetrabenazine

  tetrabenazine and prochlorperazine both decrease QTc interval. Avoid or Use Alternate Drug.

• thioridazine

  prochlorperazine and thioridazine both increase QTc interval. Avoid or Use Alternate Drug.

• tretinoin

  prochlorperazine, tretinoin. Mechanism: pharmacodynamic synergism. Avoid or Use Alternate Drug. Increased phototoxicity.

• tretinoin topical

  prochlorperazine, tretinoin topical. Mechanism: pharmacodynamic synergism. Avoid or Use Alternate Drug. Increased phototoxicity.

• trifluoperazine

  prochlorperazine and trifluoperazine both increase QTc interval. Avoid or Use Alternate Drug.

• yohimbe

  yohimbe decreases effects of prochlorperazine by pharmacodynamic antagonism. Contraindicated.

• ziprasidone

  prochlorperazine and ziprasidone both increase QTc interval. Avoid or Use Alternate Drug.

Monitor Closely (303)

• abobotulinumtoxinA

  abobotulinumtoxinA increases effects of prochlorperazine by pharmacodynamic synergism. Use Caution/Monitor. Use of anticholinergic drugs after administration of botulinum toxin-containing products may potentiate systemic anticholinergic effects.

• aclidinium

  aclidinium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of aclidinium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• acrivastine

  acrivastine and prochlorperazine both increase sedation. Use Caution/Monitor.

• albiglutide

  prochlorperazine, albiglutide. Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase or decrease glucose levels, monitor therapy closely when these agents are concurrently administered.

• albuterol

  prochlorperazine increases and albuterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• alfentanil

  alfentanil and prochlorperazine both increase sedation. Use Caution/Monitor.

• alprazolam

  alprazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• amifampridine

  prochlorperazine increases toxicity of amifampridine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Amifampridine can cause seizures. Coadministration with drugs that lower seizure threshold may increase this risk.

• amisulpride

  prochlorperazine and amisulpride both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended if coadministered.

• amitriptyline

  prochlorperazine and amitriptyline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and amitriptyline both increase sedation. Use Caution/Monitor.

• amobarbital

  amobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• amoxapine

  prochlorperazine and amoxapine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and amoxapine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and amoxapine both increase sedation. Use Caution/Monitor.

• anagrelide

  anagrelide and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• anticholinergic/sedative combos

  anticholinergic/sedative combos decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  anticholinergic/sedative combos decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of anticholinergic/sedative combos by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• apomorphine

  prochlorperazine and apomorphine both increase sedation. Use Caution/Monitor.

• arformoterol

  prochlorperazine increases and arformoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• aripiprazole

  aripiprazole and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  aripiprazole and prochlorperazine both increase sedation. Use Caution/Monitor.

• armodafinil

  prochlorperazine increases and armodafinil decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• artemether/lumefantrine

  artemether/lumefantrine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• asenapine

  asenapine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  asenapine and prochlorperazine both increase sedation. Use Caution/Monitor.

• asenapine transdermal

  asenapine transdermal and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  asenapine transdermal and prochlorperazine both increase sedation. Use Caution/Monitor.

• atracurium

  atracurium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  atracurium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of atracurium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• atropine

  atropine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  atropine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of atropine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• atropine IV/IM

  prochlorperazine increases effects of atropine IV/IM by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  atropine IV/IM decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  atropine IV/IM decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.

• avapritinib

  avapritinib and prochlorperazine both increase sedation. Use Caution/Monitor.

• azelastine

  azelastine and prochlorperazine both increase sedation. Use Caution/Monitor.

• azithromycin

  prochlorperazine and azithromycin both increase QTc interval. Use Caution/Monitor.

• baclofen

  baclofen and prochlorperazine both increase sedation. Use Caution/Monitor.

• belladonna alkaloids

  belladonna alkaloids decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  belladonna alkaloids decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of belladonna alkaloids by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• belladonna and opium

  belladonna and opium and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  belladonna and opium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  belladonna and opium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of belladonna and opium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• benperidol

  benperidol and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  benperidol and prochlorperazine both increase sedation. Use Caution/Monitor.

• benzphetamine

  prochlorperazine increases and benzphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, benzphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• benztropine

  prochlorperazine increases effects of benztropine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic adverse effects may be seen with concurrent use. .

• brexanolone

  brexanolone, prochlorperazine. Either increases toxicity of the other by sedation. Use Caution/Monitor.

• brexpiprazole

  brexpiprazole and prochlorperazine both increase sedation. Use Caution/Monitor.

• brimonidine

  brimonidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• brivaracetam

  brivaracetam and prochlorperazine both increase sedation. Use Caution/Monitor.

• brompheniramine

  brompheniramine and prochlorperazine both increase sedation. Use Caution/Monitor.

• buprenorphine

  buprenorphine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  buprenorphine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• buprenorphine buccal

  buprenorphine buccal and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  buprenorphine buccal and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• buprenorphine subdermal implant

  buprenorphine subdermal implant and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• buprenorphine transdermal

  buprenorphine transdermal and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• buprenorphine, long-acting injection

  prochlorperazine increases toxicity of buprenorphine, long-acting injection by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of buprenorphine and benzodiazepines or other CNS depressants increases risk of adverse reactions including overdose, respiratory depression, and death. Cessation of benzodiazepines or other CNS depressants is preferred in most cases. In some cases, monitoring at a higher level of care for tapering CNS depressants may be appropriate. In others, gradually tapering a patient off of a prescribed benzodiazepine or other CNS depressant or decreasing to the lowest effective dose may be appropriate.
  
  buprenorphine, long-acting injection and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• bupropion

  bupropion will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.
  
  prochlorperazine increases toxicity of bupropion by unspecified interaction mechanism. Use Caution/Monitor. May lower seizure threshold; keep bupropion dose as low as possible.

• butabarbital

  butabarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• butalbital

  butalbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• butorphanol

  butorphanol and prochlorperazine both increase sedation. Use Caution/Monitor.

• caffeine

  prochlorperazine increases and caffeine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• carbinoxamine

  carbinoxamine and prochlorperazine both increase sedation. Use Caution/Monitor.

• carisoprodol

  carisoprodol and prochlorperazine both increase sedation. Use Caution/Monitor.

• cenobamate

  cenobamate, prochlorperazine. Either increases effects of the other by sedation. Use Caution/Monitor.

• chloral hydrate

  chloral hydrate and prochlorperazine both increase sedation. Use Caution/Monitor.

• chlordiazepoxide

  chlordiazepoxide and prochlorperazine both increase sedation. Use Caution/Monitor.

• chlorpheniramine

  chlorpheniramine and prochlorperazine both increase sedation. Use Caution/Monitor.

• chlorpromazine

  chlorpromazine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  chlorpromazine and prochlorperazine both increase sedation. Use Caution/Monitor.

• chlorzoxazone

  chlorzoxazone and prochlorperazine both increase sedation. Use Caution/Monitor.

• cigarette smoking

  cigarette smoking decreases levels of prochlorperazine by increasing metabolism. Use Caution/Monitor. Interaction mainly seen w/chlorpromazine & thioridazine, but may occur w/other phenothiazines.

• cinnarizine

  cinnarizine and prochlorperazine both increase sedation. Use Caution/Monitor.

• cisatracurium

  cisatracurium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  cisatracurium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of cisatracurium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• citalopram

  citalopram and prochlorperazine both increase serotonin levels. Use Caution/Monitor. Combination may increase risk of serotonin syndrome or neuroleptic malignant syndrome-like reactions.

• clemastine

  clemastine and prochlorperazine both increase sedation. Use Caution/Monitor.

• clobazam

  prochlorperazine, clobazam. Other (see comment). Use Caution/Monitor. Comment: Concomitant administration can increase the potential for CNS effects (e.g., increased sedation or respiratory depression).

• clomipramine

  prochlorperazine and clomipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and clomipramine both increase sedation. Use Caution/Monitor.

• clonazepam

  clonazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• clonidine

  clonidine, prochlorperazine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Additive hypotensive effects; potential delirium.

• clorazepate

  clorazepate and prochlorperazine both increase sedation. Use Caution/Monitor.

• clozapine

  clozapine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  clozapine and prochlorperazine both increase sedation. Use Caution/Monitor.

• codeine

  codeine and prochlorperazine both increase sedation. Use Caution/Monitor.

• cyclizine

  cyclizine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  cyclizine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  cyclizine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of cyclizine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• cyclobenzaprine

  cyclobenzaprine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  cyclobenzaprine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  cyclobenzaprine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of cyclobenzaprine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• cyproheptadine

  cyproheptadine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dantrolene

  dantrolene and prochlorperazine both increase sedation. Use Caution/Monitor.

• daridorexant

  prochlorperazine and daridorexant both increase sedation. Modify Therapy/Monitor Closely. Coadministration increases risk of CNS depression, which can lead to additive impairment of psychomotor performance and cause daytime impairment.

• darifenacin

  darifenacin decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  darifenacin decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of darifenacin by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• dasatinib

  prochlorperazine and dasatinib both increase QTc interval. Modify Therapy/Monitor Closely.

• deferoxamine

  deferoxamine, prochlorperazine. Either increases toxicity of the other by Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Synergistic increase in neurological adverse effects.

• desflurane

  desflurane and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  desflurane and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• desipramine

  prochlorperazine and desipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and desipramine both increase sedation. Use Caution/Monitor.

• desvenlafaxine

  desvenlafaxine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor. Desvenlafaxine inhibits CYP2D6; with higher desvenlafaxine doses (ie, 400 mg) decrease the CYP2D6 substrate dose by up to 50%; no dosage adjustment needed with desvenlafaxine doses <100 mg

• deutetrabenazine

  prochlorperazine and deutetrabenazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Modify Therapy/Monitor Closely. The risk for parkinsonism, neuroleptic malignant syndrome, and akathisia may be increased by concomitant use of deutetrabenazine and dopamine antagonists or antipsychotics.
  
  deutetrabenazine and prochlorperazine both decrease QTc interval. Use Caution/Monitor. At the maximum recommended dose, deutetrabenazine does not prolong QT interval to a clinically relevant extent. Certain circumstances may increase risk of torsade de pointes and/or sudden death in association with drugs that prolong the QTc interval (eg, bradycardia, hypokalemia or hypomagnesemia, coadministration with other drugs that prolong QTc interval, presence of congenital QT prolongation).

• dexchlorpheniramine

  dexchlorpheniramine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dexfenfluramine

  prochlorperazine increases and dexfenfluramine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, dexfenfluramine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• dexmedetomidine

  dexmedetomidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dexmethylphenidate

  prochlorperazine increases and dexmethylphenidate decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, dexmethylphenidate. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• dextroamphetamine

  prochlorperazine increases and dextroamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, dextroamphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• dextromoramide

  dextromoramide and prochlorperazine both increase sedation. Use Caution/Monitor.

• diamorphine

  diamorphine and prochlorperazine both increase sedation. Use Caution/Monitor.

• diazepam

  diazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• dicyclomine

  dicyclomine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  dicyclomine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of dicyclomine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• diethylpropion

  prochlorperazine increases and diethylpropion decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, diethylpropion. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• difelikefalin

  difelikefalin and prochlorperazine both increase sedation. Use Caution/Monitor.

• difenoxin hcl

  difenoxin hcl and prochlorperazine both increase sedation. Use Caution/Monitor.

• dimenhydrinate

  dimenhydrinate and prochlorperazine both increase sedation. Use Caution/Monitor.

• diphenhydramine

  diphenhydramine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  diphenhydramine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  diphenhydramine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of diphenhydramine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• diphenoxylate hcl

  diphenoxylate hcl and prochlorperazine both increase sedation. Use Caution/Monitor.

• dipipanone

  dipipanone and prochlorperazine both increase sedation. Use Caution/Monitor.

• dobutamine

  prochlorperazine increases and dobutamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, dobutamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• dolasetron

  prochlorperazine and dolasetron both increase QTc interval. Modify Therapy/Monitor Closely.

• donepezil

  donepezil and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• donepezil transdermal

  donepezil transdermal, prochlorperazine. Either decreases effects of the other by pharmacodynamic antagonism. Use Caution/Monitor.

• dopamine

  prochlorperazine increases and dopamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, dopamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• dopexamine

  prochlorperazine increases and dopexamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• dosulepin

  prochlorperazine and dosulepin both increase sedation. Use Caution/Monitor.

• doxepin

  prochlorperazine and doxepin both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and doxepin both increase sedation. Use Caution/Monitor.

• doxylamine

  doxylamine and prochlorperazine both increase sedation. Use Caution/Monitor.

• droperidol

  droperidol and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  droperidol and prochlorperazine both increase sedation. Use Caution/Monitor.

• efavirenz

  efavirenz and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• eliglustat

  eliglustat and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• encorafenib

  encorafenib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• entrectinib

  entrectinib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• ephedrine

  prochlorperazine increases and ephedrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, ephedrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• epinephrine

  prochlorperazine increases and epinephrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, epinephrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine decreases effects of epinephrine by pharmacodynamic antagonism. Use Caution/Monitor. Block pressor response to epinephrine, which may result in severe hypotension and tachycardia.

• epinephrine racemic

  prochlorperazine increases and epinephrine racemic decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine decreases effects of epinephrine racemic by pharmacodynamic antagonism. Use Caution/Monitor. Block pressor response to epinephrine, which may result in severe hypotension and tachycardia.

• eribulin

  eribulin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• estazolam

  estazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• ethanol

  prochlorperazine and ethanol both increase sedation. Use Caution/Monitor.

• etomidate

  etomidate and prochlorperazine both increase sedation. Use Caution/Monitor.

• fenfluramine

  prochlorperazine increases and fenfluramine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, fenfluramine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• fesoterodine

  fesoterodine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  fesoterodine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of fesoterodine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• fingolimod

  fingolimod and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• flavoxate

  flavoxate decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  flavoxate decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of flavoxate by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• flecainide

  prochlorperazine and flecainide both increase QTc interval. Modify Therapy/Monitor Closely.

• fluoxetine

  fluoxetine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.
  
  prochlorperazine and fluoxetine both increase QTc interval. Use Caution/Monitor.

• fluphenazine

  fluphenazine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  fluphenazine and prochlorperazine both increase sedation. Use Caution/Monitor.

• flurazepam

  flurazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• fluvoxamine

  fluvoxamine and prochlorperazine both increase QTc interval. Use Caution/Monitor.

• formoterol

  prochlorperazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• foscarnet

  prochlorperazine and foscarnet both increase QTc interval. Modify Therapy/Monitor Closely.

• ganaxolone

  prochlorperazine and ganaxolone both increase sedation. Use Caution/Monitor.

• gemifloxacin

  gemifloxacin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• gilteritinib

  gilteritinib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• glycopyrrolate

  prochlorperazine increases effects of glycopyrrolate by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• glycopyrrolate inhaled

  glycopyrrolate inhaled decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  glycopyrrolate inhaled decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of glycopyrrolate inhaled by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• glycopyrronium tosylate topical

  glycopyrronium tosylate topical, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration of glycopyrronium tosylate topical with other anticholinergic medications may result in additive anticholinergic adverse effects.

• granisetron

  granisetron and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• guanfacine

  guanfacine, prochlorperazine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Additive hypotensive effects; potential delirium.

• haloperidol

  haloperidol and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  haloperidol and prochlorperazine both increase sedation. Use Caution/Monitor.

• henbane

  henbane decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  henbane decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of henbane by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• homatropine

  homatropine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  homatropine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of homatropine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• hydromorphone

  hydromorphone and prochlorperazine both increase sedation. Use Caution/Monitor.

• hydroxyzine

  hydroxyzine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  hydroxyzine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• hyoscyamine

  hyoscyamine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  hyoscyamine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of hyoscyamine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• hyoscyamine spray

  prochlorperazine increases effects of hyoscyamine spray by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  hyoscyamine spray decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  hyoscyamine spray decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.

• iloperidone

  iloperidone and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and iloperidone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  iloperidone and prochlorperazine both increase sedation. Use Caution/Monitor.

• imipramine

  prochlorperazine and imipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and imipramine both increase sedation. Use Caution/Monitor.

• incobotulinumtoxinA

  prochlorperazine, incobotulinumtoxinA. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Use of anticholinergic drugs after administration of botulinum toxin-containing products may potentiate systemic anticholinergic effects.

• insulin degludec

  prochlorperazine decreases effects of insulin degludec by Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase blood glucose concentrations.

• insulin degludec/insulin aspart

  prochlorperazine decreases effects of insulin degludec/insulin aspart by Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase blood glucose concentrations.

• insulin inhaled

  prochlorperazine decreases effects of insulin inhaled by Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase blood glucose concentrations.

• ipratropium

  ipratropium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  ipratropium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of ipratropium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• isoflurane

  isoflurane and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• isoproterenol

  prochlorperazine increases and isoproterenol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, isoproterenol. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• ketamine

  ketamine and prochlorperazine both increase sedation. Use Caution/Monitor.

• ketotifen, ophthalmic

  prochlorperazine and ketotifen, ophthalmic both increase sedation. Use Caution/Monitor.

• lapatinib

  prochlorperazine and lapatinib both increase QTc interval. Modify Therapy/Monitor Closely.

• lasmiditan

  lasmiditan, prochlorperazine. Either increases effects of the other by sedation. Use Caution/Monitor. Coadministration of lasmiditan and other CNS depressant drugs, including alcohol have not been evaluated in clinical studies. Lasmiditan may cause sedation, as well as other cognitive and/or neuropsychiatric adverse reactions.

• lemborexant

  lemborexant, prochlorperazine. Either increases effects of the other by sedation. Modify Therapy/Monitor Closely. Dosage adjustment may be necessary if lemborexant is coadministered with other CNS depressants because of potentially additive effects.

• levalbuterol

  prochlorperazine increases and levalbuterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• levofloxacin

  prochlorperazine and levofloxacin both increase QTc interval. Modify Therapy/Monitor Closely.

• levorphanol

  levorphanol and prochlorperazine both increase sedation. Use Caution/Monitor.

• liraglutide

  prochlorperazine, liraglutide. Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase or decrease glucose levels, monitor therapy closely when these agents are concurrently administered.

• lisdexamfetamine

  prochlorperazine increases and lisdexamfetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, lisdexamfetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• lithium

  lithium, prochlorperazine. Other (see comment). Use Caution/Monitor. Comment: Risk of neurotoxicity. Multiple mechanisms involved.
  
  lithium and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• lofepramine

  prochlorperazine and lofepramine both increase sedation. Use Caution/Monitor.

• lofexidine

  prochlorperazine and lofexidine both increase sedation. Use Caution/Monitor.

• loprazolam

  loprazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• lorazepam

  lorazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• lormetazepam

  lormetazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• loxapine

  loxapine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  loxapine and prochlorperazine both increase sedation. Use Caution/Monitor.

• loxapine inhaled

  loxapine inhaled and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  loxapine inhaled and prochlorperazine both increase sedation. Use Caution/Monitor.

• lumefantrine

  lumefantrine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• lurasidone

  lurasidone, prochlorperazine. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: Potential for increased CNS depressant effects when used concurrently; monitor for increased adverse effects and toxicity.

• maprotiline

  prochlorperazine and maprotiline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and maprotiline both increase sedation. Use Caution/Monitor.

• marijuana

  prochlorperazine and marijuana both increase sedation. Use Caution/Monitor.

• meclizine

  meclizine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  meclizine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of meclizine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• melatonin

  prochlorperazine and melatonin both increase sedation. Use Caution/Monitor.

• meperidine

  meperidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• meprobamate

  prochlorperazine and meprobamate both increase sedation. Use Caution/Monitor.

• metaproterenol

  prochlorperazine increases and metaproterenol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• metaxalone

  metaxalone and prochlorperazine both increase sedation. Use Caution/Monitor.

• metformin

  prochlorperazine decreases effects of metformin by pharmacodynamic antagonism. Use Caution/Monitor. Patient should be closely observed for loss of blood glucose control; when drugs are withdrawn from a patient receiving metformin, patient should be observed closely for hypoglycemia.

• methadone

  prochlorperazine and methadone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  methadone and prochlorperazine both increase sedation. Use Caution/Monitor.

• methamphetamine

  prochlorperazine increases and methamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, methamphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• methocarbamol

  methocarbamol and prochlorperazine both increase sedation. Use Caution/Monitor.

• methoxsalen

  methoxsalen, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive photosensitizing effects.

• methscopolamine

  methscopolamine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  methscopolamine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of methscopolamine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• methylenedioxymethamphetamine

  prochlorperazine increases and methylenedioxymethamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, methylenedioxymethamphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• methylphenidate

  prochlorperazine, methylphenidate. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• metoclopramide

  prochlorperazine and metoclopramide both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.

• midazolam

  midazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• midazolam intranasal

  midazolam intranasal, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Concomitant use of barbiturates, alcohol, or other CNS depressants may increase the risk of hypoventilation, airway obstruction, desaturation, or apnea and may contribute to profound and/or prolonged drug effect.

• midodrine

  prochlorperazine increases and midodrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, midodrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• mirtazapine

  prochlorperazine and mirtazapine both increase sedation. Use Caution/Monitor.
  
  mirtazapine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• modafinil

  prochlorperazine increases and modafinil decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• morphine

  morphine and prochlorperazine both increase sedation. Use Caution/Monitor.

• motherwort

  prochlorperazine and motherwort both increase sedation. Use Caution/Monitor.

• moxonidine

  prochlorperazine and moxonidine both increase sedation. Use Caution/Monitor.

• nabilone

  prochlorperazine and nabilone both increase sedation. Use Caution/Monitor.

• nalbuphine

  nalbuphine and prochlorperazine both increase sedation. Use Caution/Monitor.

• norepinephrine

  prochlorperazine increases and norepinephrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, norepinephrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• nortriptyline

  prochlorperazine and nortriptyline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and nortriptyline both increase sedation. Use Caution/Monitor.

• ofloxacin

  prochlorperazine and ofloxacin both increase QTc interval. Modify Therapy/Monitor Closely.

• olanzapine

  olanzapine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  olanzapine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  olanzapine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• oliceridine

  oliceridine, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation. Increased risk of hypotension if ability to maintain blood pressure has been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (eg, phenothiazines or general anesthetics).

• onabotulinumtoxinA

  onabotulinumtoxinA decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  onabotulinumtoxinA decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of onabotulinumtoxinA by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• opium tincture

  opium tincture and prochlorperazine both increase sedation. Use Caution/Monitor.

• orphenadrine

  orphenadrine and prochlorperazine both increase sedation. Use Caution/Monitor.

• oxaliplatin

  oxaliplatin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• oxazepam

  oxazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• oxybutynin

  oxybutynin decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  oxybutynin decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of oxybutynin by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• oxybutynin topical

  oxybutynin topical decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  oxybutynin topical decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of oxybutynin topical by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• oxybutynin transdermal

  oxybutynin transdermal decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  oxybutynin transdermal decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of oxybutynin transdermal by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• oxycodone

  oxycodone and prochlorperazine both increase sedation. Use Caution/Monitor.

• oxymorphone

  oxymorphone and prochlorperazine both increase sedation. Use Caution/Monitor.

• paliperidone

  paliperidone and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and paliperidone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  paliperidone and prochlorperazine both increase sedation. Use Caution/Monitor.

• pancuronium

  pancuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  pancuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of pancuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• papaveretum

  papaveretum and prochlorperazine both increase sedation. Use Caution/Monitor.

• papaverine

  prochlorperazine and papaverine both increase sedation. Use Caution/Monitor.

• paroxetine

  paroxetine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.
  
  prochlorperazine and paroxetine both increase QTc interval. Use Caution/Monitor.

• pazopanib

  prochlorperazine and pazopanib both increase QTc interval. Use Caution/Monitor.

• pentazocine

  pentazocine and prochlorperazine both increase sedation. Use Caution/Monitor.

• pentobarbital

  pentobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• perphenazine

  perphenazine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  perphenazine and prochlorperazine both increase sedation. Use Caution/Monitor.

• phendimetrazine

  prochlorperazine increases and phendimetrazine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, phendimetrazine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• phenobarbital

  phenobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• phentermine

  prochlorperazine increases and phentermine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, phentermine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• phenylephrine

  prochlorperazine increases and phenylephrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, phenylephrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• phenylephrine PO

  prochlorperazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
  
  prochlorperazine, phenylephrine PO. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• pholcodine

  prochlorperazine and pholcodine both increase sedation. Use Caution/Monitor.

• pimozide

  pimozide and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  pimozide and prochlorperazine both increase sedation. Use Caution/Monitor.

• pirbuterol

  prochlorperazine increases and pirbuterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• porfimer

  prochlorperazine, porfimer. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Enhanced photosensitivity.

• posaconazole

  prochlorperazine and posaconazole both increase QTc interval. Modify Therapy/Monitor Closely.

• pralidoxime

  pralidoxime decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  pralidoxime decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of pralidoxime by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• primaquine

  primaquine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• primidone

  primidone and prochlorperazine both increase sedation. Use Caution/Monitor.

• procarbazine

  procarbazine, prochlorperazine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Excessive sedation.

• promethazine

  prochlorperazine and promethazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  promethazine and prochlorperazine both increase sedation. Use Caution/Monitor.

• propafenone

  propafenone will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• propantheline

  propantheline decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  propantheline decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of propantheline by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• propofol

  propofol and prochlorperazine both increase sedation. Use Caution/Monitor.

• propylhexedrine

  prochlorperazine increases and propylhexedrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, propylhexedrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• protriptyline

  prochlorperazine and protriptyline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and protriptyline both increase sedation. Use Caution/Monitor.

• pseudoephedrine

  prochlorperazine, pseudoephedrine. Mechanism: unknown. Use Caution/Monitor. Consider avoiding use of pseudoephedrine in patients receiving phenothiazines (especially thioridazine) due to the potential risk of cardiac arrhythmia or sudden death. Monitor for evidence of ventricular arrhythmias during concomitant use.

• quazepam

  quazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• quetiapine

  prochlorperazine and quetiapine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and quetiapine both increase sedation. Use Caution/Monitor.

• quinidine

  quinidine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• ramelteon

  prochlorperazine and ramelteon both increase sedation. Use Caution/Monitor.

• ranolazine

  prochlorperazine and ranolazine both increase QTc interval. Modify Therapy/Monitor Closely.

• rapacuronium

  rapacuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  rapacuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of rapacuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• rimabotulinumtoxinB

  prochlorperazine, rimabotulinumtoxinB. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Anticholinergics may enhance botulinum toxin effects. Closely monitor for increased neuromuscular blockade.

• risperidone

  prochlorperazine and risperidone both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and risperidone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  prochlorperazine and risperidone both increase sedation. Use Caution/Monitor.

• rocuronium

  rocuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  rocuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of rocuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• salmeterol

  prochlorperazine increases and salmeterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• scopolamine

  scopolamine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  scopolamine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of scopolamine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• scullcap

  prochlorperazine and scullcap both increase sedation. Use Caution/Monitor.

• secobarbital

  secobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• serdexmethylphenidate/dexmethylphenidate

  prochlorperazine, serdexmethylphenidate/dexmethylphenidate. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• sertraline

  sertraline and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• sevoflurane

  sevoflurane and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  sevoflurane and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• shepherd's purse

  prochlorperazine and shepherd's purse both increase sedation. Use Caution/Monitor.

• siponimod

  siponimod and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• smoking

  smoking decreases levels of prochlorperazine by increasing metabolism. Use Caution/Monitor. Interaction mainly seen w/chlorpromazine & thioridazine, but may occur w/other phenothiazines.

• solifenacin

  solifenacin decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  solifenacin decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of solifenacin by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  solifenacin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• stiripentol

  stiripentol, prochlorperazine. Either increases effects of the other by sedation. Use Caution/Monitor. Concomitant use stiripentol with other CNS depressants, including alcohol, may increase the risk of sedation and somnolence.

• sufentanil

  sufentanil and prochlorperazine both increase sedation. Use Caution/Monitor.

• sulfamethoxazole

  prochlorperazine and sulfamethoxazole both increase QTc interval. Modify Therapy/Monitor Closely.

• sunitinib

  sunitinib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• tacrolimus

  tacrolimus and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• tapentadol

  tapentadol and prochlorperazine both increase sedation. Use Caution/Monitor.

• teduglutide

  teduglutide increases levels of prochlorperazine by Other (see comment). Use Caution/Monitor. Comment: Teduglutide may increase absorption of concomitant PO medications; caution with with drugs requiring titration or those with a narrow therapeutic index; dose adjustment may be necessary.

• telavancin

  prochlorperazine and telavancin both increase QTc interval. Modify Therapy/Monitor Closely.

• temazepam

  temazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• terbutaline

  prochlorperazine increases and terbutaline decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• tetrabenazine

  prochlorperazine and tetrabenazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Modify Therapy/Monitor Closely.

• thioridazine

  prochlorperazine and thioridazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and thioridazine both increase sedation. Use Caution/Monitor.

• thiothixene

  prochlorperazine and thiothixene both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and thiothixene both increase sedation. Use Caution/Monitor.

• tiotropium

  tiotropium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  tiotropium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of tiotropium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• tobacco use

  tobacco use decreases levels of prochlorperazine by increasing metabolism. Use Caution/Monitor. Interaction mainly seen w/chlorpromazine & thioridazine, but may occur w/other phenothiazines.

• tolterodine

  tolterodine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  tolterodine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of tolterodine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• topiramate

  prochlorperazine and topiramate both increase sedation. Modify Therapy/Monitor Closely.

• tramadol

  tramadol and prochlorperazine both increase sedation. Use Caution/Monitor.

• trazodone

  prochlorperazine and trazodone both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and trazodone both increase sedation. Use Caution/Monitor.

• triazolam

  triazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• triclofos

  triclofos and prochlorperazine both increase sedation. Use Caution/Monitor.

• trifluoperazine

  prochlorperazine and trifluoperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and trifluoperazine both increase sedation. Use Caution/Monitor.

• trihexyphenidyl

  trihexyphenidyl decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of trihexyphenidyl by pharmacodynamic synergism. Use Caution/Monitor. Potential for additive anticholinergic effects.

• trimethoprim

  prochlorperazine and trimethoprim both increase QTc interval. Modify Therapy/Monitor Closely.

• trimipramine

  prochlorperazine and trimipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and trimipramine both increase sedation. Use Caution/Monitor.

• triprolidine

  triprolidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• tropisetron

  prochlorperazine and tropisetron both increase QTc interval. Modify Therapy/Monitor Closely.

• trospium chloride

  trospium chloride decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  trospium chloride decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of trospium chloride by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• valbenazine

  valbenazine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• vecuronium

  vecuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  vecuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of vecuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• venlafaxine

  venlafaxine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.
  
  prochlorperazine and venlafaxine both increase QTc interval. Use Caution/Monitor.

• voriconazole

  prochlorperazine and voriconazole both increase QTc interval. Modify Therapy/Monitor Closely.

• vorinostat

  vorinostat and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• xylometazoline

  prochlorperazine increases and xylometazoline decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, xylometazoline. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• yohimbine

  prochlorperazine increases and yohimbine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.
  
  prochlorperazine, yohimbine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• ziconotide

  prochlorperazine and ziconotide both increase sedation. Use Caution/Monitor.

• ziprasidone

  prochlorperazine and ziprasidone both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and ziprasidone both increase sedation. Use Caution/Monitor.

• zolpidem

  prochlorperazine will increase the level or effect of zolpidem by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Additive effect of decreased alertness and psychomotor performance

• zotepine

  prochlorperazine and zotepine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and zotepine both increase sedation. Use Caution/Monitor.

Minor (60)

• amiodarone

  amiodarone will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• amitriptyline

  amitriptyline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  amitriptyline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• amoxapine

  amoxapine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  amoxapine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• asenapine

  asenapine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• atropine

  prochlorperazine increases toxicity of atropine by unknown mechanism. Minor/Significance Unknown.

• atropine IV/IM

  prochlorperazine increases toxicity of atropine IV/IM by unknown mechanism. Minor/Significance Unknown.

• benazepril

  prochlorperazine increases effects of benazepril by unspecified interaction mechanism. Minor/Significance Unknown. Enhanced hypotensive effects.

• brimonidine

  brimonidine increases effects of prochlorperazine by pharmacodynamic synergism. Minor/Significance Unknown. Increased CNS depression.

• captopril

  prochlorperazine increases effects of captopril by unspecified interaction mechanism. Minor/Significance Unknown.

• celecoxib

  celecoxib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• chasteberry

  chasteberry decreases effects of prochlorperazine by pharmacodynamic antagonism. Minor/Significance Unknown. (Theoretical interaction).

• chloroquine

  chloroquine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.
  
  chloroquine increases levels of prochlorperazine by decreasing metabolism. Minor/Significance Unknown.

• cimetidine

  cimetidine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• clomipramine

  clomipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  clomipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• darifenacin

  darifenacin will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• desipramine

  desipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  desipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• diphenhydramine

  diphenhydramine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• doxepin

  doxepin, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  doxepin, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• dronedarone

  dronedarone will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• duloxetine

  duloxetine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• enalapril

  prochlorperazine increases effects of enalapril by unspecified interaction mechanism. Minor/Significance Unknown.

• ethanol

  ethanol, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive CNS depression.

• eucalyptus

  prochlorperazine and eucalyptus both increase sedation. Minor/Significance Unknown.

• fosinopril

  prochlorperazine increases effects of fosinopril by unspecified interaction mechanism. Minor/Significance Unknown.

• glycopyrrolate

  prochlorperazine increases toxicity of glycopyrrolate by unknown mechanism. Minor/Significance Unknown.

• glycopyrrolate inhaled

  prochlorperazine increases toxicity of glycopyrrolate inhaled by unknown mechanism. Minor/Significance Unknown.

• haloperidol

  haloperidol will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• imatinib

  imatinib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• imidapril

  prochlorperazine increases effects of imidapril by unspecified interaction mechanism. Minor/Significance Unknown.

• imipramine

  imipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  imipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• lisinopril

  prochlorperazine increases effects of lisinopril by unspecified interaction mechanism. Minor/Significance Unknown.

• lofepramine

  lofepramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  lofepramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• maprotiline

  maprotiline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  maprotiline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• maraviroc

  maraviroc will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• marijuana

  marijuana will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• metyrapone

  prochlorperazine decreases effects of metyrapone by unspecified interaction mechanism. Minor/Significance Unknown.

• metyrosine

  metyrosine increases toxicity of prochlorperazine by pharmacodynamic synergism. Minor/Significance Unknown. Increased extrapyramidal symptoms.

• moexipril

  prochlorperazine increases effects of moexipril by unspecified interaction mechanism. Minor/Significance Unknown.

• nilotinib

  nilotinib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• nortriptyline

  nortriptyline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  nortriptyline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• oxybutynin

  oxybutynin increases toxicity of prochlorperazine by unspecified interaction mechanism. Minor/Significance Unknown.

• oxybutynin topical

  oxybutynin topical increases toxicity of prochlorperazine by unspecified interaction mechanism. Minor/Significance Unknown.

• oxybutynin transdermal

  oxybutynin transdermal increases toxicity of prochlorperazine by unspecified interaction mechanism. Minor/Significance Unknown.

• parecoxib

  parecoxib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• perindopril

  prochlorperazine increases effects of perindopril by unspecified interaction mechanism. Minor/Significance Unknown.

• perphenazine

  perphenazine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• protriptyline

  protriptyline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  protriptyline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• pyrimethamine

  pyrimethamine increases levels of prochlorperazine by decreasing metabolism. Minor/Significance Unknown.

• quinacrine

  quinacrine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• quinapril

  prochlorperazine increases effects of quinapril by unspecified interaction mechanism. Minor/Significance Unknown.

• ramipril

  prochlorperazine increases effects of ramipril by unspecified interaction mechanism. Minor/Significance Unknown.

• ranolazine

  ranolazine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• ritonavir

  ritonavir will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• sage

  prochlorperazine and sage both increase sedation. Minor/Significance Unknown.

• sertraline

  sertraline will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• thioridazine

  thioridazine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• tipranavir

  tipranavir will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• trandolapril

  prochlorperazine increases effects of trandolapril by unspecified interaction mechanism. Minor/Significance Unknown.

• trazodone

  trazodone, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive hypotensive effects.
  
  trazodone, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.

• trimipramine

  trimipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  trimipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• abobotulinumtoxinA

  Monitor Closely (1)abobotulinumtoxinA increases effects of prochlorperazine by pharmacodynamic synergism. Use Caution/Monitor. Use of anticholinergic drugs after administration of botulinum toxin-containing products may potentiate systemic anticholinergic effects.

• aclidinium

  Monitor Closely (2)aclidinium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of aclidinium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• acrivastine

  Monitor Closely (1)acrivastine and prochlorperazine both increase sedation. Use Caution/Monitor.

• albiglutide

  Monitor Closely (1)prochlorperazine, albiglutide. Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase or decrease glucose levels, monitor therapy closely when these agents are concurrently administered.

• albuterol

  Monitor Closely (1)prochlorperazine increases and albuterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• alfentanil

  Monitor Closely (1)alfentanil and prochlorperazine both increase sedation. Use Caution/Monitor.

• alprazolam

  Monitor Closely (1)alprazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• amifampridine

  Monitor Closely (1)prochlorperazine increases toxicity of amifampridine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Amifampridine can cause seizures. Coadministration with drugs that lower seizure threshold may increase this risk.

• aminolevulinic acid oral

  Serious - Use Alternative (1)aminolevulinic acid oral, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid administering other phototoxic drugs with aminolevulinic acid oral for 24 hr during perioperative period.

• aminolevulinic acid topical

  Serious - Use Alternative (1)prochlorperazine increases toxicity of aminolevulinic acid topical by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration of photosensitizing drugs may enhance the phototoxic reaction to photodynamic therapy with aminolevulinic acid.

• amiodarone

  Serious - Use Alternative (1)prochlorperazine and amiodarone both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)amiodarone will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• amisulpride

  Contraindicated (1)amisulpride, prochlorperazine. Either increases toxicity of the other by Other (see comment). Contraindicated. Comment: Increases risk of neuroleptic malignant syndrome.Monitor Closely (1)prochlorperazine and amisulpride both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended if coadministered.

• amitriptyline

  Monitor Closely (2)prochlorperazine and amitriptyline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and amitriptyline both increase sedation. Use Caution/Monitor.Minor (2)amitriptyline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  amitriptyline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• amobarbital

  Monitor Closely (1)amobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• amoxapine

  Monitor Closely (3)prochlorperazine and amoxapine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and amoxapine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and amoxapine both increase sedation. Use Caution/Monitor.Minor (2)amoxapine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  amoxapine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• anagrelide

  Monitor Closely (1)anagrelide and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• anticholinergic/sedative combos

  Monitor Closely (3)anticholinergic/sedative combos decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  anticholinergic/sedative combos decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of anticholinergic/sedative combos by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• apomorphine

  Monitor Closely (1)prochlorperazine and apomorphine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine decreases effects of apomorphine by pharmacodynamic antagonism. Avoid or Use Alternate Drug.

• arformoterol

  Monitor Closely (1)prochlorperazine increases and arformoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• aripiprazole

  Monitor Closely (2)aripiprazole and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  aripiprazole and prochlorperazine both increase sedation. Use Caution/Monitor.

• armodafinil

  Monitor Closely (1)prochlorperazine increases and armodafinil decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• arsenic trioxide

  Serious - Use Alternative (1)prochlorperazine and arsenic trioxide both increase QTc interval. Avoid or Use Alternate Drug.

• artemether/lumefantrine

  Monitor Closely (1)artemether/lumefantrine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and artemether/lumefantrine both increase QTc interval. Avoid or Use Alternate Drug.

• asenapine

  Monitor Closely (2)asenapine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  asenapine and prochlorperazine both increase sedation. Use Caution/Monitor.Minor (1)asenapine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• asenapine transdermal

  Monitor Closely (2)asenapine transdermal and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  asenapine transdermal and prochlorperazine both increase sedation. Use Caution/Monitor.

• atracurium

  Monitor Closely (3)atracurium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  atracurium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of atracurium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• atropine

  Monitor Closely (3)atropine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  atropine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of atropine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)prochlorperazine increases toxicity of atropine by unknown mechanism. Minor/Significance Unknown.

• atropine IV/IM

  Monitor Closely (3)prochlorperazine increases effects of atropine IV/IM by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  atropine IV/IM decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  atropine IV/IM decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.Minor (1)prochlorperazine increases toxicity of atropine IV/IM by unknown mechanism. Minor/Significance Unknown.

• avapritinib

  Monitor Closely (1)avapritinib and prochlorperazine both increase sedation. Use Caution/Monitor.

• azelastine

  Monitor Closely (1)azelastine and prochlorperazine both increase sedation. Use Caution/Monitor.

• azithromycin

  Monitor Closely (1)prochlorperazine and azithromycin both increase QTc interval. Use Caution/Monitor.

• baclofen

  Monitor Closely (1)baclofen and prochlorperazine both increase sedation. Use Caution/Monitor.

• belladonna alkaloids

  Monitor Closely (3)belladonna alkaloids decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  belladonna alkaloids decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of belladonna alkaloids by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• belladonna and opium

  Monitor Closely (4)belladonna and opium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  belladonna and opium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of belladonna and opium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  belladonna and opium and prochlorperazine both increase sedation. Use Caution/Monitor.

• benazepril

  Minor (1)prochlorperazine increases effects of benazepril by unspecified interaction mechanism. Minor/Significance Unknown. Enhanced hypotensive effects.

• benperidol

  Monitor Closely (2)benperidol and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  benperidol and prochlorperazine both increase sedation. Use Caution/Monitor.

• benzhydrocodone/acetaminophen

  Serious - Use Alternative (2)benzhydrocodone/acetaminophen, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation. Increased risk of hypotension if ability to maintain blood pressure has been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (eg, phenothiazines or general anesthetics).
  
  benzhydrocodone/acetaminophen and prochlorperazine both increase sedation. Avoid or Use Alternate Drug. Limit use to patients for whom alternative treatment options are inadequate

• benzphetamine

  Monitor Closely (2)prochlorperazine, benzphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and benzphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• benztropine

  Monitor Closely (1)prochlorperazine increases effects of benztropine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic adverse effects may be seen with concurrent use. .

• brexanolone

  Monitor Closely (1)brexanolone, prochlorperazine. Either increases toxicity of the other by sedation. Use Caution/Monitor.

• brexpiprazole

  Monitor Closely (1)brexpiprazole and prochlorperazine both increase sedation. Use Caution/Monitor.

• brimonidine

  Monitor Closely (1)brimonidine and prochlorperazine both increase sedation. Use Caution/Monitor.Minor (1)brimonidine increases effects of prochlorperazine by pharmacodynamic synergism. Minor/Significance Unknown. Increased CNS depression.

• brivaracetam

  Monitor Closely (1)brivaracetam and prochlorperazine both increase sedation. Use Caution/Monitor.

• bromocriptine

  Serious - Use Alternative (1)prochlorperazine decreases effects of bromocriptine by pharmacodynamic antagonism. Avoid or Use Alternate Drug.

• brompheniramine

  Monitor Closely (1)brompheniramine and prochlorperazine both increase sedation. Use Caution/Monitor.

• buprenorphine

  Monitor Closely (2)buprenorphine and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  buprenorphine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• buprenorphine buccal

  Monitor Closely (2)buprenorphine buccal and prochlorperazine both increase sedation. Use Caution/Monitor.
  
  buprenorphine buccal and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• buprenorphine subdermal implant

  Monitor Closely (1)buprenorphine subdermal implant and prochlorperazine both decrease QTc interval. Use Caution/Monitor.Serious - Use Alternative (1)buprenorphine subdermal implant and prochlorperazine both increase sedation. Avoid or Use Alternate Drug. Limit use to patients for whom alternative treatment options are inadequate

• buprenorphine transdermal

  Monitor Closely (1)buprenorphine transdermal and prochlorperazine both decrease QTc interval. Use Caution/Monitor.Serious - Use Alternative (1)buprenorphine transdermal and prochlorperazine both increase sedation. Avoid or Use Alternate Drug. Limit use to patients for whom alternative treatment options are inadequate

• buprenorphine, long-acting injection

  Monitor Closely (2)buprenorphine, long-acting injection and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  prochlorperazine increases toxicity of buprenorphine, long-acting injection by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of buprenorphine and benzodiazepines or other CNS depressants increases risk of adverse reactions including overdose, respiratory depression, and death. Cessation of benzodiazepines or other CNS depressants is preferred in most cases. In some cases, monitoring at a higher level of care for tapering CNS depressants may be appropriate. In others, gradually tapering a patient off of a prescribed benzodiazepine or other CNS depressant or decreasing to the lowest effective dose may be appropriate.

• bupropion

  Monitor Closely (2)prochlorperazine increases toxicity of bupropion by unspecified interaction mechanism. Use Caution/Monitor. May lower seizure threshold; keep bupropion dose as low as possible.
  
  bupropion will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• butabarbital

  Monitor Closely (1)butabarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• butalbital

  Monitor Closely (1)butalbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• butorphanol

  Monitor Closely (1)butorphanol and prochlorperazine both increase sedation. Use Caution/Monitor.

• cabergoline

  Serious - Use Alternative (1)prochlorperazine decreases effects of cabergoline by pharmacodynamic antagonism. Contraindicated.

• caffeine

  Monitor Closely (1)prochlorperazine increases and caffeine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• calcium/magnesium/potassium/sodium oxybates

  Serious - Use Alternative (1)prochlorperazine, calcium/magnesium/potassium/sodium oxybates. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

• captopril

  Minor (1)prochlorperazine increases effects of captopril by unspecified interaction mechanism. Minor/Significance Unknown.

• carbinoxamine

  Monitor Closely (1)carbinoxamine and prochlorperazine both increase sedation. Use Caution/Monitor.

• carisoprodol

  Monitor Closely (1)carisoprodol and prochlorperazine both increase sedation. Use Caution/Monitor.

• celecoxib

  Minor (1)celecoxib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• cenobamate

  Monitor Closely (1)cenobamate, prochlorperazine. Either increases effects of the other by sedation. Use Caution/Monitor.

• chasteberry

  Minor (1)chasteberry decreases effects of prochlorperazine by pharmacodynamic antagonism. Minor/Significance Unknown. (Theoretical interaction).

• chloral hydrate

  Monitor Closely (1)chloral hydrate and prochlorperazine both increase sedation. Use Caution/Monitor.

• chlordiazepoxide

  Monitor Closely (1)chlordiazepoxide and prochlorperazine both increase sedation. Use Caution/Monitor.

• chloroquine

  Minor (2)chloroquine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.
  
  chloroquine increases levels of prochlorperazine by decreasing metabolism. Minor/Significance Unknown.

• chlorpheniramine

  Monitor Closely (1)chlorpheniramine and prochlorperazine both increase sedation. Use Caution/Monitor.

• chlorpromazine

  Monitor Closely (2)chlorpromazine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  chlorpromazine and prochlorperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)chlorpromazine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• chlorzoxazone

  Monitor Closely (1)chlorzoxazone and prochlorperazine both increase sedation. Use Caution/Monitor.

• cigarette smoking

  Monitor Closely (1)cigarette smoking decreases levels of prochlorperazine by increasing metabolism. Use Caution/Monitor. Interaction mainly seen w/chlorpromazine & thioridazine, but may occur w/other phenothiazines.

• cimetidine

  Minor (1)cimetidine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• cinnarizine

  Monitor Closely (1)cinnarizine and prochlorperazine both increase sedation. Use Caution/Monitor.

• cisatracurium

  Monitor Closely (3)cisatracurium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  cisatracurium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of cisatracurium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• citalopram

  Monitor Closely (1)citalopram and prochlorperazine both increase serotonin levels. Use Caution/Monitor. Combination may increase risk of serotonin syndrome or neuroleptic malignant syndrome-like reactions.

• clarithromycin

  Serious - Use Alternative (1)prochlorperazine and clarithromycin both increase QTc interval. Avoid or Use Alternate Drug.

• clemastine

  Monitor Closely (1)clemastine and prochlorperazine both increase sedation. Use Caution/Monitor.

• clobazam

  Monitor Closely (1)prochlorperazine, clobazam. Other (see comment). Use Caution/Monitor. Comment: Concomitant administration can increase the potential for CNS effects (e.g., increased sedation or respiratory depression).

• clomipramine

  Monitor Closely (2)prochlorperazine and clomipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and clomipramine both increase sedation. Use Caution/Monitor.Minor (2)clomipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  clomipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• clonazepam

  Monitor Closely (1)clonazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• clonidine

  Monitor Closely (1)clonidine, prochlorperazine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Additive hypotensive effects; potential delirium.

• clorazepate

  Monitor Closely (1)clorazepate and prochlorperazine both increase sedation. Use Caution/Monitor.

• clozapine

  Monitor Closely (2)clozapine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  clozapine and prochlorperazine both increase sedation. Use Caution/Monitor.

• codeine

  Monitor Closely (1)codeine and prochlorperazine both increase sedation. Use Caution/Monitor.

• cyclizine

  Monitor Closely (4)cyclizine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  cyclizine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of cyclizine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  cyclizine and prochlorperazine both increase sedation. Use Caution/Monitor.

• cyclobenzaprine

  Monitor Closely (4)cyclobenzaprine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  cyclobenzaprine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of cyclobenzaprine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  cyclobenzaprine and prochlorperazine both increase sedation. Use Caution/Monitor.

• cyproheptadine

  Monitor Closely (1)cyproheptadine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dantrolene

  Monitor Closely (1)dantrolene and prochlorperazine both increase sedation. Use Caution/Monitor.

• daridorexant

  Monitor Closely (1)prochlorperazine and daridorexant both increase sedation. Modify Therapy/Monitor Closely. Coadministration increases risk of CNS depression, which can lead to additive impairment of psychomotor performance and cause daytime impairment.

• darifenacin

  Monitor Closely (3)darifenacin decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  darifenacin decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of darifenacin by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)darifenacin will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• dasatinib

  Monitor Closely (1)prochlorperazine and dasatinib both increase QTc interval. Modify Therapy/Monitor Closely.

• deferoxamine

  Monitor Closely (1)deferoxamine, prochlorperazine. Either increases toxicity of the other by Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Synergistic increase in neurological adverse effects.

• degarelix

  Serious - Use Alternative (1)degarelix and prochlorperazine both decrease QTc interval. Avoid or Use Alternate Drug.

• desflurane

  Monitor Closely (2)desflurane and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  desflurane and prochlorperazine both increase sedation. Use Caution/Monitor.

• desipramine

  Monitor Closely (2)prochlorperazine and desipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and desipramine both increase sedation. Use Caution/Monitor.Minor (2)desipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  desipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• desvenlafaxine

  Monitor Closely (1)desvenlafaxine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor. Desvenlafaxine inhibits CYP2D6; with higher desvenlafaxine doses (ie, 400 mg) decrease the CYP2D6 substrate dose by up to 50%; no dosage adjustment needed with desvenlafaxine doses <100 mg

• deutetrabenazine

  Monitor Closely (2)deutetrabenazine and prochlorperazine both decrease QTc interval. Use Caution/Monitor. At the maximum recommended dose, deutetrabenazine does not prolong QT interval to a clinically relevant extent. Certain circumstances may increase risk of torsade de pointes and/or sudden death in association with drugs that prolong the QTc interval (eg, bradycardia, hypokalemia or hypomagnesemia, coadministration with other drugs that prolong QTc interval, presence of congenital QT prolongation).
  
  prochlorperazine and deutetrabenazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Modify Therapy/Monitor Closely. The risk for parkinsonism, neuroleptic malignant syndrome, and akathisia may be increased by concomitant use of deutetrabenazine and dopamine antagonists or antipsychotics.

• dexchlorpheniramine

  Monitor Closely (1)dexchlorpheniramine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dexfenfluramine

  Monitor Closely (2)prochlorperazine, dexfenfluramine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and dexfenfluramine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• dexmedetomidine

  Monitor Closely (1)dexmedetomidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dexmethylphenidate

  Monitor Closely (2)prochlorperazine, dexmethylphenidate. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and dexmethylphenidate decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• dextroamphetamine

  Monitor Closely (2)prochlorperazine, dextroamphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and dextroamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• dextromoramide

  Monitor Closely (1)dextromoramide and prochlorperazine both increase sedation. Use Caution/Monitor.

• diamorphine

  Monitor Closely (1)diamorphine and prochlorperazine both increase sedation. Use Caution/Monitor.

• diazepam

  Monitor Closely (1)diazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• dicyclomine

  Monitor Closely (3)dicyclomine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  dicyclomine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of dicyclomine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• diethylpropion

  Monitor Closely (2)prochlorperazine, diethylpropion. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and diethylpropion decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• difelikefalin

  Monitor Closely (1)difelikefalin and prochlorperazine both increase sedation. Use Caution/Monitor.

• difenoxin hcl

  Monitor Closely (1)difenoxin hcl and prochlorperazine both increase sedation. Use Caution/Monitor.

• dimenhydrinate

  Monitor Closely (1)dimenhydrinate and prochlorperazine both increase sedation. Use Caution/Monitor.

• diphenhydramine

  Monitor Closely (4)diphenhydramine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  diphenhydramine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of diphenhydramine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  diphenhydramine and prochlorperazine both increase sedation. Use Caution/Monitor.Minor (1)diphenhydramine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• diphenoxylate hcl

  Monitor Closely (1)diphenoxylate hcl and prochlorperazine both increase sedation. Use Caution/Monitor.

• dipipanone

  Monitor Closely (1)dipipanone and prochlorperazine both increase sedation. Use Caution/Monitor.

• disopyramide

  Contraindicated (1)prochlorperazine and disopyramide both increase QTc interval. Contraindicated.

• dobutamine

  Monitor Closely (2)prochlorperazine, dobutamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and dobutamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• dofetilide

  Serious - Use Alternative (1)prochlorperazine and dofetilide both increase QTc interval. Avoid or Use Alternate Drug.

• dolasetron

  Monitor Closely (1)prochlorperazine and dolasetron both increase QTc interval. Modify Therapy/Monitor Closely.

• donepezil

  Monitor Closely (1)donepezil and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• donepezil transdermal

  Monitor Closely (1)donepezil transdermal, prochlorperazine. Either decreases effects of the other by pharmacodynamic antagonism. Use Caution/Monitor.

• dopamine

  Monitor Closely (2)prochlorperazine, dopamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and dopamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine decreases effects of dopamine by pharmacodynamic antagonism. Contraindicated.

• dopexamine

  Monitor Closely (1)prochlorperazine increases and dopexamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• dosulepin

  Monitor Closely (1)prochlorperazine and dosulepin both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and dosulepin both increase QTc interval. Avoid or Use Alternate Drug.

• doxepin

  Monitor Closely (2)prochlorperazine and doxepin both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and doxepin both increase sedation. Use Caution/Monitor.Minor (2)doxepin, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  doxepin, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• doxylamine

  Monitor Closely (1)doxylamine and prochlorperazine both increase sedation. Use Caution/Monitor.

• dronedarone

  Serious - Use Alternative (1)prochlorperazine and dronedarone both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)dronedarone will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• droperidol

  Monitor Closely (2)droperidol and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  droperidol and prochlorperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and droperidol both increase QTc interval. Avoid or Use Alternate Drug.

• duloxetine

  Minor (1)duloxetine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• efavirenz

  Monitor Closely (1)efavirenz and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• eliglustat

  Monitor Closely (1)eliglustat and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• enalapril

  Minor (1)prochlorperazine increases effects of enalapril by unspecified interaction mechanism. Minor/Significance Unknown.

• encorafenib

  Monitor Closely (1)encorafenib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• entrectinib

  Monitor Closely (1)entrectinib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• ephedrine

  Monitor Closely (2)prochlorperazine, ephedrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and ephedrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• epinephrine

  Monitor Closely (3)prochlorperazine, epinephrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine decreases effects of epinephrine by pharmacodynamic antagonism. Use Caution/Monitor. Block pressor response to epinephrine, which may result in severe hypotension and tachycardia.
  
  prochlorperazine increases and epinephrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.Serious - Use Alternative (1)epinephrine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• epinephrine racemic

  Monitor Closely (2)prochlorperazine decreases effects of epinephrine racemic by pharmacodynamic antagonism. Use Caution/Monitor. Block pressor response to epinephrine, which may result in severe hypotension and tachycardia.
  
  prochlorperazine increases and epinephrine racemic decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.Serious - Use Alternative (1)epinephrine racemic and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• eribulin

  Monitor Closely (1)eribulin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• erythromycin base

  Serious - Use Alternative (1)prochlorperazine and erythromycin base both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  Serious - Use Alternative (1)prochlorperazine and erythromycin ethylsuccinate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  Serious - Use Alternative (1)prochlorperazine and erythromycin lactobionate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin stearate

  Serious - Use Alternative (1)prochlorperazine and erythromycin stearate both increase QTc interval. Avoid or Use Alternate Drug.

• estazolam

  Monitor Closely (1)estazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• ethanol

  Monitor Closely (1)prochlorperazine and ethanol both increase sedation. Use Caution/Monitor.Minor (1)ethanol, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive CNS depression.

• etomidate

  Monitor Closely (1)etomidate and prochlorperazine both increase sedation. Use Caution/Monitor.

• eucalyptus

  Minor (1)prochlorperazine and eucalyptus both increase sedation. Minor/Significance Unknown.

• fenfluramine

  Monitor Closely (2)prochlorperazine, fenfluramine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and fenfluramine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• fentanyl

  Serious - Use Alternative (1)fentanyl, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fentanyl intranasal

  Serious - Use Alternative (1)fentanyl intranasal, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fentanyl transdermal

  Serious - Use Alternative (1)fentanyl transdermal, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fentanyl transmucosal

  Serious - Use Alternative (1)fentanyl transmucosal, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration with other CNS depressants, such as skeletal muscle relaxants, may cause respiratory depression, hypotension, profound sedation, coma, and/or death. Consider dose reduction of either or both agents to avoid serious adverse effects. Monitor for hypotension, respiratory depression, and profound sedation.

• fesoterodine

  Monitor Closely (3)fesoterodine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  fesoterodine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of fesoterodine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• fingolimod

  Monitor Closely (1)fingolimod and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• flavoxate

  Monitor Closely (3)flavoxate decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  flavoxate decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of flavoxate by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• flecainide

  Monitor Closely (1)prochlorperazine and flecainide both increase QTc interval. Modify Therapy/Monitor Closely.

• fluconazole

  Serious - Use Alternative (1)prochlorperazine and fluconazole both increase QTc interval. Avoid or Use Alternate Drug.

• fluoxetine

  Monitor Closely (2)prochlorperazine and fluoxetine both increase QTc interval. Use Caution/Monitor.
  
  fluoxetine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• fluphenazine

  Monitor Closely (2)fluphenazine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  fluphenazine and prochlorperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)fluphenazine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.

• flurazepam

  Monitor Closely (1)flurazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• fluvoxamine

  Monitor Closely (1)fluvoxamine and prochlorperazine both increase QTc interval. Use Caution/Monitor.

• formoterol

  Monitor Closely (1)prochlorperazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and formoterol both increase QTc interval. Avoid or Use Alternate Drug.

• foscarnet

  Monitor Closely (1)prochlorperazine and foscarnet both increase QTc interval. Modify Therapy/Monitor Closely.

• fosinopril

  Minor (1)prochlorperazine increases effects of fosinopril by unspecified interaction mechanism. Minor/Significance Unknown.

• ganaxolone

  Monitor Closely (1)prochlorperazine and ganaxolone both increase sedation. Use Caution/Monitor.

• gemifloxacin

  Monitor Closely (1)gemifloxacin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• gilteritinib

  Monitor Closely (1)gilteritinib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• glycopyrrolate

  Monitor Closely (1)prochlorperazine increases effects of glycopyrrolate by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)prochlorperazine increases toxicity of glycopyrrolate by unknown mechanism. Minor/Significance Unknown.

• glycopyrrolate inhaled

  Monitor Closely (3)glycopyrrolate inhaled decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  glycopyrrolate inhaled decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of glycopyrrolate inhaled by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)prochlorperazine increases toxicity of glycopyrrolate inhaled by unknown mechanism. Minor/Significance Unknown.

• glycopyrronium tosylate topical

  Monitor Closely (1)glycopyrronium tosylate topical, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration of glycopyrronium tosylate topical with other anticholinergic medications may result in additive anticholinergic adverse effects.

• granisetron

  Monitor Closely (1)granisetron and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• guanfacine

  Monitor Closely (1)guanfacine, prochlorperazine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Additive hypotensive effects; potential delirium.

• haloperidol

  Monitor Closely (2)haloperidol and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  haloperidol and prochlorperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and haloperidol both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)haloperidol will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• henbane

  Monitor Closely (3)henbane decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  henbane decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of henbane by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• homatropine

  Monitor Closely (3)homatropine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  homatropine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of homatropine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• hydrocodone

  Serious - Use Alternative (1)hydrocodone, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation. Increased risk of hypotension if ability to maintain blood pressure has been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (eg, phenothiazines or general anesthetics).

• hydromorphone

  Monitor Closely (1)hydromorphone and prochlorperazine both increase sedation. Use Caution/Monitor.

• hydroxyzine

  Monitor Closely (2)hydroxyzine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  hydroxyzine and prochlorperazine both increase sedation. Use Caution/Monitor.

• hyoscyamine

  Monitor Closely (3)hyoscyamine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  hyoscyamine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of hyoscyamine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• hyoscyamine spray

  Monitor Closely (3)prochlorperazine increases effects of hyoscyamine spray by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  hyoscyamine spray decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  hyoscyamine spray decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.

• ibutilide

  Contraindicated (1)prochlorperazine and ibutilide both increase QTc interval. Contraindicated.

• iloperidone

  Monitor Closely (3)prochlorperazine and iloperidone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  iloperidone and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  iloperidone and prochlorperazine both increase sedation. Use Caution/Monitor.

• imatinib

  Minor (1)imatinib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• imidapril

  Minor (1)prochlorperazine increases effects of imidapril by unspecified interaction mechanism. Minor/Significance Unknown.

• imipramine

  Monitor Closely (2)prochlorperazine and imipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and imipramine both increase sedation. Use Caution/Monitor.Minor (2)imipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  imipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• incobotulinumtoxinA

  Monitor Closely (1)prochlorperazine, incobotulinumtoxinA. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Use of anticholinergic drugs after administration of botulinum toxin-containing products may potentiate systemic anticholinergic effects.

• indapamide

  Contraindicated (1)prochlorperazine and indapamide both increase QTc interval. Contraindicated.

• insulin degludec

  Monitor Closely (1)prochlorperazine decreases effects of insulin degludec by Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase blood glucose concentrations.

• insulin degludec/insulin aspart

  Monitor Closely (1)prochlorperazine decreases effects of insulin degludec/insulin aspart by Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase blood glucose concentrations.

• insulin inhaled

  Monitor Closely (1)prochlorperazine decreases effects of insulin inhaled by Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase blood glucose concentrations.

• ipratropium

  Monitor Closely (3)ipratropium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  ipratropium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of ipratropium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• isoflurane

  Monitor Closely (1)isoflurane and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• isoproterenol

  Monitor Closely (2)prochlorperazine, isoproterenol. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and isoproterenol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• itraconazole

  Serious - Use Alternative (1)prochlorperazine and itraconazole both increase QTc interval. Avoid or Use Alternate Drug.

• ketamine

  Monitor Closely (1)ketamine and prochlorperazine both increase sedation. Use Caution/Monitor.

• ketoconazole

  Serious - Use Alternative (1)prochlorperazine and ketoconazole both increase QTc interval. Avoid or Use Alternate Drug.

• ketotifen, ophthalmic

  Monitor Closely (1)prochlorperazine and ketotifen, ophthalmic both increase sedation. Use Caution/Monitor.

• lapatinib

  Monitor Closely (1)prochlorperazine and lapatinib both increase QTc interval. Modify Therapy/Monitor Closely.

• lasmiditan

  Monitor Closely (1)lasmiditan, prochlorperazine. Either increases effects of the other by sedation. Use Caution/Monitor. Coadministration of lasmiditan and other CNS depressant drugs, including alcohol have not been evaluated in clinical studies. Lasmiditan may cause sedation, as well as other cognitive and/or neuropsychiatric adverse reactions.

• lemborexant

  Monitor Closely (1)lemborexant, prochlorperazine. Either increases effects of the other by sedation. Modify Therapy/Monitor Closely. Dosage adjustment may be necessary if lemborexant is coadministered with other CNS depressants because of potentially additive effects.

• levalbuterol

  Monitor Closely (1)prochlorperazine increases and levalbuterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• levodopa

  Serious - Use Alternative (1)prochlorperazine decreases effects of levodopa by pharmacodynamic antagonism. Avoid or Use Alternate Drug.

• levodopa inhaled

  Serious - Use Alternative (1)prochlorperazine decreases effects of levodopa inhaled by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Phenothiazine/1st generation antipsychotics inhibit dopamine D2 receptors in varying degrees.

• levofloxacin

  Monitor Closely (1)prochlorperazine and levofloxacin both increase QTc interval. Modify Therapy/Monitor Closely.

• levoketoconazole

  Serious - Use Alternative (1)prochlorperazine and levoketoconazole both increase QTc interval. Avoid or Use Alternate Drug.

• levorphanol

  Monitor Closely (1)levorphanol and prochlorperazine both increase sedation. Use Caution/Monitor.

• liraglutide

  Monitor Closely (1)prochlorperazine, liraglutide. Other (see comment). Use Caution/Monitor. Comment: Phenothiazines may increase or decrease glucose levels, monitor therapy closely when these agents are concurrently administered.

• lisdexamfetamine

  Monitor Closely (2)prochlorperazine, lisdexamfetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and lisdexamfetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• lisinopril

  Minor (1)prochlorperazine increases effects of lisinopril by unspecified interaction mechanism. Minor/Significance Unknown.

• lisuride

  Serious - Use Alternative (1)prochlorperazine decreases effects of lisuride by pharmacodynamic antagonism. Contraindicated.

• lithium

  Monitor Closely (2)lithium, prochlorperazine. Other (see comment). Use Caution/Monitor. Comment: Risk of neurotoxicity. Multiple mechanisms involved.
  
  lithium and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• lofepramine

  Monitor Closely (1)prochlorperazine and lofepramine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and lofepramine both increase QTc interval. Avoid or Use Alternate Drug.Minor (2)lofepramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  lofepramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• lofexidine

  Monitor Closely (1)prochlorperazine and lofexidine both increase sedation. Use Caution/Monitor.

• loprazolam

  Monitor Closely (1)loprazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• lorazepam

  Monitor Closely (1)lorazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• lormetazepam

  Monitor Closely (1)lormetazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• loxapine

  Monitor Closely (2)loxapine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  loxapine and prochlorperazine both increase sedation. Use Caution/Monitor.

• loxapine inhaled

  Monitor Closely (2)loxapine inhaled and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  loxapine inhaled and prochlorperazine both increase sedation. Use Caution/Monitor.

• lumefantrine

  Monitor Closely (1)lumefantrine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and lumefantrine both increase QTc interval. Avoid or Use Alternate Drug.

• lurasidone

  Monitor Closely (1)lurasidone, prochlorperazine. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: Potential for increased CNS depressant effects when used concurrently; monitor for increased adverse effects and toxicity.

• maprotiline

  Monitor Closely (2)prochlorperazine and maprotiline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and maprotiline both increase sedation. Use Caution/Monitor.Minor (2)maprotiline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  maprotiline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• maraviroc

  Minor (1)maraviroc will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• marijuana

  Monitor Closely (1)prochlorperazine and marijuana both increase sedation. Use Caution/Monitor.Minor (1)marijuana will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• meclizine

  Monitor Closely (3)meclizine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  meclizine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of meclizine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• melatonin

  Monitor Closely (1)prochlorperazine and melatonin both increase sedation. Use Caution/Monitor.

• meperidine

  Monitor Closely (1)meperidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• meprobamate

  Monitor Closely (1)prochlorperazine and meprobamate both increase sedation. Use Caution/Monitor.

• metaproterenol

  Monitor Closely (1)prochlorperazine increases and metaproterenol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• metaxalone

  Monitor Closely (1)metaxalone and prochlorperazine both increase sedation. Use Caution/Monitor.

• metformin

  Monitor Closely (1)prochlorperazine decreases effects of metformin by pharmacodynamic antagonism. Use Caution/Monitor. Patient should be closely observed for loss of blood glucose control; when drugs are withdrawn from a patient receiving metformin, patient should be observed closely for hypoglycemia.

• methadone

  Monitor Closely (2)prochlorperazine and methadone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  methadone and prochlorperazine both increase sedation. Use Caution/Monitor.

• methamphetamine

  Monitor Closely (2)prochlorperazine, methamphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and methamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• methocarbamol

  Monitor Closely (1)methocarbamol and prochlorperazine both increase sedation. Use Caution/Monitor.

• methoxsalen

  Monitor Closely (1)methoxsalen, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive photosensitizing effects.

• methscopolamine

  Monitor Closely (3)methscopolamine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  methscopolamine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of methscopolamine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• methyl aminolevulinate

  Serious - Use Alternative (1)prochlorperazine, methyl aminolevulinate. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Each drug may increase the photosensitizing effect of the other.

• methyldopa

  Serious - Use Alternative (1)prochlorperazine decreases effects of methyldopa by pharmacodynamic antagonism. Contraindicated.

• methylenedioxymethamphetamine

  Monitor Closely (2)prochlorperazine, methylenedioxymethamphetamine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and methylenedioxymethamphetamine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• methylphenidate

  Monitor Closely (1)prochlorperazine, methylphenidate. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• metoclopramide

  Monitor Closely (1)prochlorperazine and metoclopramide both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.

• metoclopramide intranasal

  Serious - Use Alternative (2)prochlorperazine, metoclopramide intranasal. Either increases effects of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Avoid use of metoclopramide intranasal or interacting drug, depending on importance of drug to patient.
  
  prochlorperazine increases toxicity of metoclopramide intranasal by pharmacodynamic synergism. Avoid or Use Alternate Drug. Potential for additive effects, including increased frequency and severity of tardive dyskinesia, other extrapyramidal symptoms, and neuroleptic malignant syndrome.

• metrizamide

  Contraindicated (1)prochlorperazine, metrizamide. Mechanism: unknown. Contraindicated. Risk of seizure. D/C phenothiazine 24h before admin. of metrizamide.

• metyrapone

  Minor (1)prochlorperazine decreases effects of metyrapone by unspecified interaction mechanism. Minor/Significance Unknown.

• metyrosine

  Minor (1)metyrosine increases toxicity of prochlorperazine by pharmacodynamic synergism. Minor/Significance Unknown. Increased extrapyramidal symptoms.

• midazolam

  Monitor Closely (1)midazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• midazolam intranasal

  Monitor Closely (1)midazolam intranasal, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Concomitant use of barbiturates, alcohol, or other CNS depressants may increase the risk of hypoventilation, airway obstruction, desaturation, or apnea and may contribute to profound and/or prolonged drug effect.

• midodrine

  Monitor Closely (2)prochlorperazine, midodrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and midodrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• mirtazapine

  Monitor Closely (2)mirtazapine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  prochlorperazine and mirtazapine both increase sedation. Use Caution/Monitor.

• modafinil

  Monitor Closely (1)prochlorperazine increases and modafinil decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• moexipril

  Minor (1)prochlorperazine increases effects of moexipril by unspecified interaction mechanism. Minor/Significance Unknown.

• morphine

  Monitor Closely (1)morphine and prochlorperazine both increase sedation. Use Caution/Monitor.

• motherwort

  Monitor Closely (1)prochlorperazine and motherwort both increase sedation. Use Caution/Monitor.

• moxifloxacin

  Serious - Use Alternative (1)prochlorperazine and moxifloxacin both increase QTc interval. Avoid or Use Alternate Drug.

• moxonidine

  Monitor Closely (1)prochlorperazine and moxonidine both increase sedation. Use Caution/Monitor.

• nabilone

  Monitor Closely (1)prochlorperazine and nabilone both increase sedation. Use Caution/Monitor.

• nalbuphine

  Monitor Closely (1)nalbuphine and prochlorperazine both increase sedation. Use Caution/Monitor.

• nilotinib

  Serious - Use Alternative (1)prochlorperazine and nilotinib both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)nilotinib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• norepinephrine

  Monitor Closely (2)prochlorperazine, norepinephrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and norepinephrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• nortriptyline

  Monitor Closely (2)prochlorperazine and nortriptyline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and nortriptyline both increase sedation. Use Caution/Monitor.Minor (2)nortriptyline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  nortriptyline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• octreotide

  Serious - Use Alternative (1)prochlorperazine and octreotide both increase QTc interval. Avoid or Use Alternate Drug.

• octreotide (Antidote)

  Serious - Use Alternative (1)prochlorperazine and octreotide (Antidote) both increase QTc interval. Avoid or Use Alternate Drug.

• ofloxacin

  Monitor Closely (1)prochlorperazine and ofloxacin both increase QTc interval. Modify Therapy/Monitor Closely.

• olanzapine

  Monitor Closely (3)olanzapine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  olanzapine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  olanzapine and prochlorperazine both increase sedation. Use Caution/Monitor.

• oliceridine

  Monitor Closely (1)oliceridine, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation. Increased risk of hypotension if ability to maintain blood pressure has been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (eg, phenothiazines or general anesthetics).

• olopatadine intranasal

  Serious - Use Alternative (1)prochlorperazine and olopatadine intranasal both increase sedation. Avoid or Use Alternate Drug. Coadministration increases risk of CNS depression, which can lead to additive impairment of psychomotor performance and cause daytime impairment.

• onabotulinumtoxinA

  Monitor Closely (3)onabotulinumtoxinA decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  onabotulinumtoxinA decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of onabotulinumtoxinA by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• opium tincture

  Monitor Closely (1)opium tincture and prochlorperazine both increase sedation. Use Caution/Monitor.

• orphenadrine

  Monitor Closely (1)orphenadrine and prochlorperazine both increase sedation. Use Caution/Monitor.

• oxaliplatin

  Monitor Closely (1)oxaliplatin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• oxazepam

  Monitor Closely (1)oxazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• oxybutynin

  Monitor Closely (3)oxybutynin decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  oxybutynin decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of oxybutynin by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)oxybutynin increases toxicity of prochlorperazine by unspecified interaction mechanism. Minor/Significance Unknown.

• oxybutynin topical

  Monitor Closely (3)oxybutynin topical decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  oxybutynin topical decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of oxybutynin topical by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)oxybutynin topical increases toxicity of prochlorperazine by unspecified interaction mechanism. Minor/Significance Unknown.

• oxybutynin transdermal

  Monitor Closely (3)oxybutynin transdermal decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  oxybutynin transdermal decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of oxybutynin transdermal by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.Minor (1)oxybutynin transdermal increases toxicity of prochlorperazine by unspecified interaction mechanism. Minor/Significance Unknown.

• oxycodone

  Monitor Closely (1)oxycodone and prochlorperazine both increase sedation. Use Caution/Monitor.

• oxymorphone

  Monitor Closely (1)oxymorphone and prochlorperazine both increase sedation. Use Caution/Monitor.

• paliperidone

  Monitor Closely (3)prochlorperazine and paliperidone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  paliperidone and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  paliperidone and prochlorperazine both increase sedation. Use Caution/Monitor.

• pancuronium

  Monitor Closely (3)pancuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  pancuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of pancuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• papaveretum

  Monitor Closely (1)papaveretum and prochlorperazine both increase sedation. Use Caution/Monitor.

• papaverine

  Monitor Closely (1)prochlorperazine and papaverine both increase sedation. Use Caution/Monitor.

• parecoxib

  Minor (1)parecoxib will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• paroxetine

  Monitor Closely (2)prochlorperazine and paroxetine both increase QTc interval. Use Caution/Monitor.
  
  paroxetine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• pazopanib

  Monitor Closely (1)prochlorperazine and pazopanib both increase QTc interval. Use Caution/Monitor.

• pentamidine

  Contraindicated (1)prochlorperazine and pentamidine both increase QTc interval. Contraindicated.

• pentazocine

  Monitor Closely (1)pentazocine and prochlorperazine both increase sedation. Use Caution/Monitor.

• pentobarbital

  Monitor Closely (1)pentobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• perindopril

  Minor (1)prochlorperazine increases effects of perindopril by unspecified interaction mechanism. Minor/Significance Unknown.

• perphenazine

  Monitor Closely (2)perphenazine and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  perphenazine and prochlorperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)perphenazine and prochlorperazine both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)perphenazine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• phendimetrazine

  Monitor Closely (2)prochlorperazine, phendimetrazine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and phendimetrazine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• phenobarbital

  Monitor Closely (1)phenobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• phentermine

  Monitor Closely (2)prochlorperazine, phentermine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and phentermine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• phenylephrine

  Monitor Closely (2)prochlorperazine, phenylephrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and phenylephrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• phenylephrine PO

  Monitor Closely (2)prochlorperazine, phenylephrine PO. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .

• pholcodine

  Monitor Closely (1)prochlorperazine and pholcodine both increase sedation. Use Caution/Monitor.

• pimozide

  Contraindicated (1)prochlorperazine and pimozide both increase QTc interval. Contraindicated.Monitor Closely (2)pimozide and prochlorperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  pimozide and prochlorperazine both increase sedation. Use Caution/Monitor.

• pirbuterol

  Monitor Closely (1)prochlorperazine increases and pirbuterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• porfimer

  Monitor Closely (1)prochlorperazine, porfimer. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Enhanced photosensitivity.

• posaconazole

  Monitor Closely (1)prochlorperazine and posaconazole both increase QTc interval. Modify Therapy/Monitor Closely.

• pralidoxime

  Monitor Closely (3)pralidoxime decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  pralidoxime decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of pralidoxime by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• pramipexole

  Serious - Use Alternative (1)prochlorperazine decreases effects of pramipexole by pharmacodynamic antagonism. Contraindicated.

• primaquine

  Monitor Closely (1)primaquine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• primidone

  Monitor Closely (1)primidone and prochlorperazine both increase sedation. Use Caution/Monitor.

• procainamide

  Contraindicated (1)prochlorperazine and procainamide both increase QTc interval. Contraindicated.

• procarbazine

  Monitor Closely (1)procarbazine, prochlorperazine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Excessive sedation.

• promazine

  Serious - Use Alternative (1)prochlorperazine and promazine both increase QTc interval. Avoid or Use Alternate Drug.

• promethazine

  Monitor Closely (2)prochlorperazine and promethazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  promethazine and prochlorperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and promethazine both increase QTc interval. Avoid or Use Alternate Drug.

• propafenone

  Monitor Closely (1)propafenone will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• propantheline

  Monitor Closely (3)propantheline decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  propantheline decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of propantheline by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• propofol

  Monitor Closely (1)propofol and prochlorperazine both increase sedation. Use Caution/Monitor.

• propylhexedrine

  Monitor Closely (2)prochlorperazine, propylhexedrine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and propylhexedrine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• protriptyline

  Monitor Closely (2)prochlorperazine and protriptyline both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and protriptyline both increase sedation. Use Caution/Monitor.Minor (2)protriptyline, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  protriptyline, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• pseudoephedrine

  Monitor Closely (1)prochlorperazine, pseudoephedrine. Mechanism: unknown. Use Caution/Monitor. Consider avoiding use of pseudoephedrine in patients receiving phenothiazines (especially thioridazine) due to the potential risk of cardiac arrhythmia or sudden death. Monitor for evidence of ventricular arrhythmias during concomitant use.

• pyrimethamine

  Minor (1)pyrimethamine increases levels of prochlorperazine by decreasing metabolism. Minor/Significance Unknown.

• quazepam

  Monitor Closely (1)quazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• quetiapine

  Monitor Closely (2)prochlorperazine and quetiapine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and quetiapine both increase sedation. Use Caution/Monitor.

• quinacrine

  Minor (1)quinacrine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• quinapril

  Minor (1)prochlorperazine increases effects of quinapril by unspecified interaction mechanism. Minor/Significance Unknown.

• quinidine

  Contraindicated (1)prochlorperazine and quinidine both increase QTc interval. Contraindicated.Monitor Closely (1)quinidine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)quinidine, prochlorperazine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Additive cardiac effects.

• ramelteon

  Monitor Closely (1)prochlorperazine and ramelteon both increase sedation. Use Caution/Monitor.

• ramipril

  Minor (1)prochlorperazine increases effects of ramipril by unspecified interaction mechanism. Minor/Significance Unknown.

• ranolazine

  Monitor Closely (1)prochlorperazine and ranolazine both increase QTc interval. Modify Therapy/Monitor Closely.Minor (1)ranolazine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• rapacuronium

  Monitor Closely (3)rapacuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  rapacuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of rapacuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• rimabotulinumtoxinB

  Monitor Closely (1)prochlorperazine, rimabotulinumtoxinB. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Anticholinergics may enhance botulinum toxin effects. Closely monitor for increased neuromuscular blockade.

• risperidone

  Monitor Closely (3)prochlorperazine and risperidone both increase QTc interval. Modify Therapy/Monitor Closely.
  
  prochlorperazine and risperidone both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and risperidone both increase sedation. Use Caution/Monitor.

• ritonavir

  Minor (1)ritonavir will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• rocuronium

  Monitor Closely (3)rocuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  rocuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of rocuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• ropinirole

  Serious - Use Alternative (1)prochlorperazine decreases effects of ropinirole by pharmacodynamic antagonism. Contraindicated.

• safinamide

  Serious - Use Alternative (1)prochlorperazine decreases effects of safinamide by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Dopamine antagonists may decrease safinamide effects and exacerbate Parkinson disease symptoms.

• sage

  Minor (1)prochlorperazine and sage both increase sedation. Minor/Significance Unknown.

• salmeterol

  Monitor Closely (1)prochlorperazine increases and salmeterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• saquinavir

  Serious - Use Alternative (1)saquinavir, prochlorperazine. Either increases toxicity of the other by QTc interval. Avoid or Use Alternate Drug. Increased risk of QT prolongation and cardiac arrhythmias.

• scopolamine

  Monitor Closely (3)scopolamine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  scopolamine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of scopolamine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• scullcap

  Monitor Closely (1)prochlorperazine and scullcap both increase sedation. Use Caution/Monitor.

• secobarbital

  Monitor Closely (1)secobarbital and prochlorperazine both increase sedation. Use Caution/Monitor.

• selinexor

  Serious - Use Alternative (1)selinexor, prochlorperazine. unspecified interaction mechanism. Avoid or Use Alternate Drug. Patients treated with selinexor may experience neurological toxicities. Avoid taking selinexor with other medications that may cause dizziness or confusion.

• serdexmethylphenidate/dexmethylphenidate

  Monitor Closely (1)prochlorperazine, serdexmethylphenidate/dexmethylphenidate. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.

• sertraline

  Monitor Closely (1)sertraline and prochlorperazine both decrease QTc interval. Use Caution/Monitor.Minor (1)sertraline will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• sevoflurane

  Monitor Closely (2)sevoflurane and prochlorperazine both decrease QTc interval. Use Caution/Monitor.
  
  sevoflurane and prochlorperazine both increase sedation. Use Caution/Monitor.

• shepherd's purse

  Monitor Closely (1)prochlorperazine and shepherd's purse both increase sedation. Use Caution/Monitor.

• siponimod

  Monitor Closely (1)siponimod and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• smoking

  Monitor Closely (1)smoking decreases levels of prochlorperazine by increasing metabolism. Use Caution/Monitor. Interaction mainly seen w/chlorpromazine & thioridazine, but may occur w/other phenothiazines.

• sodium oxybate

  Serious - Use Alternative (1)prochlorperazine, sodium oxybate. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Profound sedation, respiratory depression, coma, and death may result if coadministered. Reserve concomitant prescribing of these drugs in patients for whom other treatment options are inadequate. Limit dosages and durations to the minimum required. Monitor closely for signs of respiratory depression and sedation.

• solifenacin

  Monitor Closely (4)solifenacin decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  solifenacin decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of solifenacin by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.
  
  solifenacin and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• sotalol

  Contraindicated (1)prochlorperazine and sotalol both increase QTc interval. Contraindicated.

• stiripentol

  Monitor Closely (1)stiripentol, prochlorperazine. Either increases effects of the other by sedation. Use Caution/Monitor. Concomitant use stiripentol with other CNS depressants, including alcohol, may increase the risk of sedation and somnolence.

• sufentanil

  Monitor Closely (1)sufentanil and prochlorperazine both increase sedation. Use Caution/Monitor.

• sulfamethoxazole

  Monitor Closely (1)prochlorperazine and sulfamethoxazole both increase QTc interval. Modify Therapy/Monitor Closely.

• sunitinib

  Monitor Closely (1)sunitinib and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• tacrolimus

  Monitor Closely (1)tacrolimus and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• tapentadol

  Monitor Closely (1)tapentadol and prochlorperazine both increase sedation. Use Caution/Monitor.

• teduglutide

  Monitor Closely (1)teduglutide increases levels of prochlorperazine by Other (see comment). Use Caution/Monitor. Comment: Teduglutide may increase absorption of concomitant PO medications; caution with with drugs requiring titration or those with a narrow therapeutic index; dose adjustment may be necessary.

• telavancin

  Monitor Closely (1)prochlorperazine and telavancin both increase QTc interval. Modify Therapy/Monitor Closely.

• temazepam

  Monitor Closely (1)temazepam and prochlorperazine both increase sedation. Use Caution/Monitor.

• terbutaline

  Monitor Closely (1)prochlorperazine increases and terbutaline decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• tetrabenazine

  Monitor Closely (1)prochlorperazine and tetrabenazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)tetrabenazine and prochlorperazine both decrease QTc interval. Avoid or Use Alternate Drug.

• thioridazine

  Monitor Closely (2)prochlorperazine and thioridazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and thioridazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and thioridazine both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)thioridazine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• thiothixene

  Monitor Closely (2)prochlorperazine and thiothixene both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and thiothixene both increase sedation. Use Caution/Monitor.

• tiotropium

  Monitor Closely (3)tiotropium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  tiotropium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of tiotropium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• tipranavir

  Minor (1)tipranavir will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Minor/Significance Unknown.

• tobacco use

  Monitor Closely (1)tobacco use decreases levels of prochlorperazine by increasing metabolism. Use Caution/Monitor. Interaction mainly seen w/chlorpromazine & thioridazine, but may occur w/other phenothiazines.

• tolterodine

  Monitor Closely (3)tolterodine decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  tolterodine decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of tolterodine by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• topiramate

  Monitor Closely (1)prochlorperazine and topiramate both increase sedation. Modify Therapy/Monitor Closely.

• tramadol

  Monitor Closely (1)tramadol and prochlorperazine both increase sedation. Use Caution/Monitor.

• trandolapril

  Minor (1)prochlorperazine increases effects of trandolapril by unspecified interaction mechanism. Minor/Significance Unknown.

• trazodone

  Monitor Closely (2)prochlorperazine and trazodone both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and trazodone both increase sedation. Use Caution/Monitor.Minor (2)trazodone, prochlorperazine. Either increases toxicity of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive hypotensive effects.
  
  trazodone, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.

• tretinoin

  Serious - Use Alternative (1)prochlorperazine, tretinoin. Mechanism: pharmacodynamic synergism. Avoid or Use Alternate Drug. Increased phototoxicity.

• tretinoin topical

  Serious - Use Alternative (1)prochlorperazine, tretinoin topical. Mechanism: pharmacodynamic synergism. Avoid or Use Alternate Drug. Increased phototoxicity.

• triazolam

  Monitor Closely (1)triazolam and prochlorperazine both increase sedation. Use Caution/Monitor.

• triclofos

  Monitor Closely (1)triclofos and prochlorperazine both increase sedation. Use Caution/Monitor.

• trifluoperazine

  Monitor Closely (2)prochlorperazine and trifluoperazine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and trifluoperazine both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and trifluoperazine both increase QTc interval. Avoid or Use Alternate Drug.

• trihexyphenidyl

  Monitor Closely (2)trihexyphenidyl decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of trihexyphenidyl by pharmacodynamic synergism. Use Caution/Monitor. Potential for additive anticholinergic effects.

• trimethoprim

  Monitor Closely (1)prochlorperazine and trimethoprim both increase QTc interval. Modify Therapy/Monitor Closely.

• trimipramine

  Monitor Closely (2)prochlorperazine and trimipramine both increase QTc interval. Use Caution/Monitor.
  
  prochlorperazine and trimipramine both increase sedation. Use Caution/Monitor.Minor (2)trimipramine, prochlorperazine. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown. Additive anticholinergic effects.
  
  trimipramine, prochlorperazine. Either increases levels of the other by pharmacodynamic synergism. Minor/Significance Unknown. Additive anticholinergic effects.

• triprolidine

  Monitor Closely (1)triprolidine and prochlorperazine both increase sedation. Use Caution/Monitor.

• tropisetron

  Monitor Closely (1)prochlorperazine and tropisetron both increase QTc interval. Modify Therapy/Monitor Closely.

• trospium chloride

  Monitor Closely (3)trospium chloride decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  trospium chloride decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of trospium chloride by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• valbenazine

  Monitor Closely (1)valbenazine and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• vecuronium

  Monitor Closely (3)vecuronium decreases levels of prochlorperazine by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.
  
  vecuronium decreases levels of prochlorperazine by pharmacodynamic antagonism. Use Caution/Monitor.
  
  prochlorperazine increases effects of vecuronium by pharmacodynamic synergism. Use Caution/Monitor. Additive anticholinergic effects, possible hypoglycemia.

• venlafaxine

  Monitor Closely (2)prochlorperazine and venlafaxine both increase QTc interval. Use Caution/Monitor.
  
  venlafaxine will increase the level or effect of prochlorperazine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Monitor.

• voriconazole

  Monitor Closely (1)prochlorperazine and voriconazole both increase QTc interval. Modify Therapy/Monitor Closely.

• vorinostat

  Monitor Closely (1)vorinostat and prochlorperazine both decrease QTc interval. Use Caution/Monitor.

• xylometazoline

  Monitor Closely (2)prochlorperazine, xylometazoline. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and xylometazoline decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• yohimbe

  Serious - Use Alternative (1)yohimbe decreases effects of prochlorperazine by pharmacodynamic antagonism. Contraindicated.

• yohimbine

  Monitor Closely (2)prochlorperazine, yohimbine. Mechanism: unknown. Use Caution/Monitor. Risk of cardiac arrhythmia or sudden death, more likely w/thioridazine than other phenothiazines. Interaction more likely in certain predisposed pts. only.
  
  prochlorperazine increases and yohimbine decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• ziconotide

  Monitor Closely (1)prochlorperazine and ziconotide both increase sedation. Use Caution/Monitor.

• ziprasidone

  Monitor Closely (2)prochlorperazine and ziprasidone both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and ziprasidone both increase sedation. Use Caution/Monitor.Serious - Use Alternative (1)prochlorperazine and ziprasidone both increase QTc interval. Avoid or Use Alternate Drug.

• zolpidem

  Monitor Closely (1)prochlorperazine will increase the level or effect of zolpidem by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Additive effect of decreased alertness and psychomotor performance

• zotepine

  Monitor Closely (2)prochlorperazine and zotepine both increase antidopaminergic effects, including extrapyramidal symptoms and neuroleptic malignant syndrome. Use Caution/Monitor.
  
  prochlorperazine and zotepine both increase sedation. Use Caution/Monitor.