Dosing & Uses
Dosage Forms & Strengths
tablet
- 5mg
- 10mg
Sinus Congestion
10 mg PO q4hr PRN; not to exceed 60 mg/24 hr
Dosage Forms & Strengths
tablet
- 5mg
- 10mg
Sinus Congestion
<12 year: Safety and efficacy not established
≥12 years: 10 mg PO q4hr PRN; not to exceed 60 mg/24 hr
Interactions
Interaction Checker
No Results

Contraindicated
Serious - Use Alternative
Significant - Monitor Closely
Minor

Contraindicated (7)
- isocarboxazid
isocarboxazid increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
- linezolid
linezolid increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
- phenelzine
phenelzine increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
- procarbazine
procarbazine increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
- rasagiline
rasagiline increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
- selegiline
selegiline increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
- tranylcypromine
tranylcypromine increases effects of phenylephrine PO by pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
Serious - Use Alternative (29)
- amitriptyline
amitriptyline, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- amoxapine
amoxapine, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- bromocriptine
bromocriptine, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- cabergoline
cabergoline, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- clomipramine
clomipramine, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- desflurane
desflurane increases levels of phenylephrine PO by decreasing metabolism. Contraindicated.
desflurane increases toxicity of phenylephrine PO by Mechanism: unknown. Avoid or Use Alternate Drug. Risk of V tach, HTN. - desipramine
desipramine, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- dihydroergotamine
dihydroergotamine, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- dihydroergotamine intranasal
dihydroergotamine intranasal, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- doxapram
doxapram increases effects of phenylephrine PO by pharmacodynamic synergism. Avoid or Use Alternate Drug. Additive pressor effect.
- doxepin
doxepin, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- ergoloid mesylates
ergoloid mesylates, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- ergotamine
ergotamine, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- ether
ether increases toxicity of phenylephrine PO by Mechanism: unknown. Avoid or Use Alternate Drug. Risk of V tach, HTN.
- etomidate
etomidate increases levels of phenylephrine PO by decreasing metabolism. Contraindicated.
- imipramine
imipramine, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- isoflurane
isoflurane increases toxicity of phenylephrine PO by Mechanism: unknown. Avoid or Use Alternate Drug. Risk of V tach, HTN.
- ketamine
ketamine increases levels of phenylephrine PO by decreasing metabolism. Contraindicated.
- lofepramine
lofepramine, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- maprotiline
maprotiline, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- methoxyflurane
methoxyflurane increases toxicity of phenylephrine PO by Mechanism: unknown. Avoid or Use Alternate Drug. Risk of V tach, HTN.
- methylergonovine
methylergonovine, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Additive vasospasm; risk of hypertension.
- nortriptyline
nortriptyline, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- propofol
propofol increases levels of phenylephrine PO by decreasing metabolism. Contraindicated.
- protriptyline
protriptyline, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- sevoflurane
sevoflurane increases levels of phenylephrine PO by decreasing metabolism. Contraindicated.
sevoflurane increases toxicity of phenylephrine PO by Mechanism: unknown. Avoid or Use Alternate Drug. Risk of V tach, HTN. - trazodone
trazodone, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- trimipramine
trimipramine, phenylephrine PO. Other (see comment). Avoid or Use Alternate Drug. Comment: Tricyclic antidepressants increase or decrease effects of sympathomimetics, by blocking reuptake of NE, or blocking uptake of indirect sympathomimetics into the adrenergic neuron.
- yohimbe
yohimbe, phenylephrine PO. Mechanism: pharmacodynamic synergism. Contraindicated. Risk of acute hypertensive episode.
Monitor Closely (177)
- albuterol
albuterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
albuterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - alfentanil
alfentanil increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- alprazolam
alprazolam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- amisulpride
amisulpride increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- amitriptyline
amitriptyline increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- amobarbital
amobarbital increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- amoxapine
amoxapine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- apomorphine
apomorphine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- arformoterol
arformoterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
arformoterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - aripiprazole
aripiprazole increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- armodafinil
armodafinil and phenylephrine PO both decrease sedation. Use Caution/Monitor.
- azelastine
azelastine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- baclofen
baclofen increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- belladonna and opium
belladonna and opium increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- benperidol
benperidol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- benzphetamine
benzphetamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
benzphetamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - brompheniramine
brompheniramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- buprenorphine
buprenorphine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- buprenorphine buccal
buprenorphine buccal increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- butabarbital
butabarbital increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- butalbital
butalbital increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- butorphanol
butorphanol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- caffeine
caffeine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
- carbinoxamine
carbinoxamine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- carisoprodol
carisoprodol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- chloral hydrate
chloral hydrate increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- chlordiazepoxide
chlordiazepoxide increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- chlorpheniramine
chlorpheniramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- chlorpromazine
chlorpromazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
chlorpromazine, 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. - chlorzoxazone
chlorzoxazone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- cinnarizine
cinnarizine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- clemastine
clemastine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- clomipramine
clomipramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- clonazepam
clonazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- clorazepate
clorazepate increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- clozapine
clozapine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- codeine
codeine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- cyclizine
cyclizine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- cyclobenzaprine
cyclobenzaprine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- cyproheptadine
cyproheptadine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dantrolene
dantrolene increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- desflurane
desflurane increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- desipramine
desipramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dexchlorpheniramine
dexchlorpheniramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dexfenfluramine
dexfenfluramine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
dexfenfluramine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - dexmedetomidine
dexmedetomidine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dexmethylphenidate
dexmethylphenidate and phenylephrine PO both decrease sedation. Use Caution/Monitor.
dexmethylphenidate and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - dextroamphetamine
dextroamphetamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
dextroamphetamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - dextromoramide
dextromoramide increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- diamorphine
diamorphine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- diazepam
diazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- diethylpropion
diethylpropion and phenylephrine PO both decrease sedation. Use Caution/Monitor.
diethylpropion and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - difenoxin hcl
difenoxin hcl increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dimenhydrinate
dimenhydrinate increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- diphenhydramine
diphenhydramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- diphenoxylate hcl
diphenoxylate hcl increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dipipanone
dipipanone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- dobutamine
dobutamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
dobutamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - dopamine
dopamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
dopamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - dopexamine
dopexamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
dopexamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - doxepin
doxepin increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- doxylamine
doxylamine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- droperidol
droperidol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- droxidopa
phenylephrine PO and droxidopa both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. May increase risk for supine hypertension
- ephedrine
ephedrine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
ephedrine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.
ephedrine, phenylephrine PO. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. - epinephrine
epinephrine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
epinephrine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - epinephrine racemic
epinephrine racemic and phenylephrine PO both decrease sedation. Use Caution/Monitor.
epinephrine racemic and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - esketamine intranasal
esketamine intranasal, phenylephrine PO. Either increases toxicity of the other by sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. Closely monitor blood pressure with concomitant use of esketamine nasal with stimulants. .
- estazolam
estazolam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- ethanol
ethanol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- etomidate
etomidate increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- fenfluramine
fenfluramine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
fenfluramine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - fluphenazine
fluphenazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
fluphenazine, 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. - flurazepam
flurazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- formoterol
formoterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
formoterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - haloperidol
haloperidol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- hydralazine
hydralazine, phenylephrine PO. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of hypertension.
- hydromorphone
hydromorphone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- hydroxyzine
hydroxyzine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- iloperidone
iloperidone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- imipramine
imipramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- isoproterenol
isoproterenol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
isoproterenol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - ketamine
ketamine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- ketotifen, ophthalmic
ketotifen, ophthalmic increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- levalbuterol
levalbuterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
levalbuterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - lisdexamfetamine
lisdexamfetamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
lisdexamfetamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - lofepramine
lofepramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- lofexidine
lofexidine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- loprazolam
loprazolam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- lorazepam
lorazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- lormetazepam
lormetazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- loxapine
loxapine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- loxapine inhaled
loxapine inhaled increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- maprotiline
maprotiline increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- marijuana
marijuana increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- melatonin
melatonin increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- meperidine
meperidine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- meprobamate
meprobamate increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- metaproterenol
metaproterenol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
metaproterenol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - metaxalone
metaxalone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- methadone
methadone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- methamphetamine
methamphetamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
methamphetamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - methocarbamol
methocarbamol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- methyldopa
methyldopa increases effects of phenylephrine PO by unknown mechanism. Use Caution/Monitor.
- methylenedioxymethamphetamine
methylenedioxymethamphetamine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
methylenedioxymethamphetamine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - midazolam
midazolam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- midodrine
midodrine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
midodrine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - mirtazapine
mirtazapine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- modafinil
modafinil and phenylephrine PO both decrease sedation. Use Caution/Monitor.
- morphine
morphine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- motherwort
motherwort increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- moxonidine
moxonidine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- nabilone
nabilone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- nadolol
nadolol increases effects of phenylephrine PO by pharmacodynamic synergism. Use Caution/Monitor. Risk of acute hypertensive episode (rare).
- nalbuphine
nalbuphine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- norepinephrine
norepinephrine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
norepinephrine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - nortriptyline
nortriptyline increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- olanzapine
olanzapine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- opium tincture
opium tincture increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- orphenadrine
orphenadrine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- oxazepam
oxazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- oxycodone
oxycodone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- oxymorphone
oxymorphone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- oxytocin
oxytocin increases effects of phenylephrine PO by pharmacodynamic synergism. Use Caution/Monitor.
- paliperidone
paliperidone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- papaveretum
papaveretum increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- papaverine
papaverine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- pentazocine
pentazocine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- pentobarbital
pentobarbital increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- perphenazine
perphenazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
perphenazine, 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. - phendimetrazine
phendimetrazine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
phendimetrazine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - phenobarbital
phenobarbital increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- phentermine
phentermine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
phentermine and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - pholcodine
pholcodine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- pimozide
pimozide increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- pindolol
pindolol increases effects of phenylephrine PO by pharmacodynamic synergism. Use Caution/Monitor. Risk of acute hypertensive episode (rare).
- pirbuterol
pirbuterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
pirbuterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - primidone
primidone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- prochlorperazine
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. - promazine
promazine, 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.
- promethazine
promethazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
promethazine, 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. - propofol
propofol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- propranolol
propranolol increases effects of phenylephrine PO by pharmacodynamic synergism. Use Caution/Monitor. Risk of acute hypertensive episode (rare).
- propylhexedrine
phenylephrine PO and propylhexedrine both decrease sedation. Use Caution/Monitor.
phenylephrine PO and propylhexedrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - protriptyline
protriptyline increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- pseudoephedrine
phenylephrine PO and pseudoephedrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.
- quazepam
quazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- quetiapine
quetiapine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- ramelteon
ramelteon increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- risperidone
risperidone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- rotigotine
rotigotine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- safinamide
phenylephrine PO and safinamide both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. Monitor patients for hypertension if safinamide is prescribed concomitantly with prescription or nonprescription sympathomimetics, including nasal, oral, or ophthalmic decongestants and cold remedies.
- salmeterol
salmeterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.
salmeterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - scullcap
scullcap increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- secobarbital
secobarbital increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- serdexmethylphenidate/dexmethylphenidate
serdexmethylphenidate/dexmethylphenidate and phenylephrine PO both decrease sedation. Use Caution/Monitor.
serdexmethylphenidate/dexmethylphenidate and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - sevoflurane
sevoflurane increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- shepherd's purse
shepherd's purse increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- solriamfetol
phenylephrine PO and solriamfetol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.
- sufentanil
sufentanil increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- tapentadol
tapentadol increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- temazepam
temazepam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- terbutaline
terbutaline and phenylephrine PO both decrease sedation. Use Caution/Monitor.
terbutaline and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - thioridazine
thioridazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
thioridazine, 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. - thiothixene
thiothixene increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- timolol
timolol increases effects of phenylephrine PO by pharmacodynamic synergism. Use Caution/Monitor. Risk of acute hypertensive episode (rare).
- topiramate
topiramate increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely. .
- trazodone
trazodone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- triazolam
triazolam increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- triclofos
triclofos increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- trifluoperazine
trifluoperazine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
trifluoperazine, 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. - trimipramine
trimipramine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- triprolidine
triprolidine increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- xylometazoline
phenylephrine PO and xylometazoline both decrease sedation. Use Caution/Monitor.
phenylephrine PO and xylometazoline both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - yohimbine
yohimbine and phenylephrine PO both decrease sedation. Use Caution/Monitor.
phenylephrine PO and yohimbine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. - ziconotide
ziconotide increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
- ziprasidone
ziprasidone increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor. .
Minor (12)
- alfuzosin
alfuzosin, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- asenapine
asenapine, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- desmopressin
desmopressin increases effects of phenylephrine PO by pharmacodynamic synergism. Minor/Significance Unknown.
- doxazosin
doxazosin, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- eucalyptus
eucalyptus increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Minor/Significance Unknown. .
- moxisylyte
moxisylyte, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- phenoxybenzamine
phenoxybenzamine, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- phentolamine
phentolamine, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- prazosin
prazosin, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- sage
sage increases and phenylephrine PO decreases sedation. Effect of interaction is not clear, use caution. Minor/Significance Unknown. .
- silodosin
silodosin, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
- terazosin
terazosin, phenylephrine PO. Either decreases effects of the other by Mechanism: pharmacodynamic antagonism. Minor/Significance Unknown.
Adverse Effects
Frequency Not Defined
Palpitation
Tachycardia
Premature ventricular contractions
Occipital headache
Insomnia
Resltessness
Gastric irritation
Tremor
Pallor or blanching
Trembling or tremors
Increased perspiration
Respiratory distress
Hypertension
Warnings
Contraindications
Hypersensitivity
Use within 14 days of monoamine oxidase inhibitor therapy
Cautions
Some products may contain sulfites, which may cause allergic reactions in susceptible individuals
Closely monitor in hyperthyroidism, DM, heart disease, bowel obstruction/narrowing, increased intraocular pressure, BPH
Use caution in the elderly, in patients with bowel obstruction/narrowing, asthma, diabetes mellitus, cardiovascular disease, hyperthyroidism, hypertension, hyperplasia, increased intraocular pressure, and prostatic hyperplasia; if symptoms do not improve within 7 days or are accompanied by fever, contact healthcare professional
Discontinue and inform healthcare provider if dizziness, nervousness, or sleeplessness occur
Hypertension may occur when used concurrently with monoamine oxidase inhibitors; use extreme caution
The elderly may be more predisposed to adverse effects from sympathomimetics; they often have diabetes mellitus and cardiovascular disease as well as multiple drug therapies
Counsel the elderly about proper use of OTC products and the types of diseases the drug should be avoided
Pregnancy & Lactation
Pregnancy Category: C
Lactation: Not known if excreted in breast milk
Pregnancy Categories
A: Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.
B: May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk. C: Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done. D: Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk. X: Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist. NA: Information not available.Pharmacology
Mechanism of Action
Alpha adrenergic agonist that produces systemic arterial vasoconstriction
Pharmcokinetics
Absorption: Rapid and complete
Duration: 2-4 hr (decongestant)
Onset: 15-30 min
Vd: 26-61 L
Metabolism: Liver & intestine by MAO
Excretion: Urine
Bioavailability: <38%
Half-life elimination: 2-3hr (terminal phase)
Peak plasma time: 0.75-2 hr
Excretion: Urine
Administration
Storage
Tablet: Store between 20-25ºC (68-77ºF); do not use if carton or blister unit is opened or broken
Images
BRAND | FORM. | UNIT PRICE | PILL IMAGE |
---|---|---|---|
Vazculep injection - | 10 mg/mL vial | ![]() | |
Vazculep injection - | 10 mg/mL vial | ![]() | |
Vazculep injection - | 10 mg/mL vial | ![]() | |
Vazculep injection - | 10 mg/mL vial | ![]() | |
Vazculep injection - | 10 mg/mL vial | ![]() | |
phenylephrine ophthalmic (eye) - | 10 % drops | ![]() | |
phenylephrine ophthalmic (eye) - | 2.5 % drops | ![]() | |
phenylephrine ophthalmic (eye) - | 10 % drops | ![]() | |
phenylephrine ophthalmic (eye) - | 2.5 % drops | ![]() | |
phenylephrine ophthalmic (eye) - | 2.5 % drops | ![]() | |
Wal-Four nasal - | 1 % liquid | ![]() | |
Wal-Four nasal - | 1 % liquid | ![]() | |
Sinus Decongestant (PE) oral - | 10 mg tablet | ![]() | |
Sinus Decongestant (PE) oral - | 10 mg tablet | ![]() | |
Sinus Decongestant (PE) oral - | 10 mg tablet | ![]() | |
Neo-Synephrine (phenylephrine) nasal - | 1 % liquid | ![]() | |
Neo-Synephrine (phenylephrine) nasal - | 1 % liquid | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
phenylephrine injection - | 10 mg/mL vial | ![]() | |
4 Way nasal - | 1 % liquid | ![]() | |
Nasal Decongestant (phenylephrine) oral - | 10 mg tablet | ![]() | |
Nasal Four nasal - | 1 % liquid | ![]() | |
Sinus PE Decongestant oral - | 10 mg tablet | ![]() | |
Ephrine nasal - | 1 % drops | ![]() | |
Wal-phed PE oral - | 10 mg tablet | ![]() |
Copyright © 2010 First DataBank, Inc.
Patient Handout
phenylephrine injection
NO MONOGRAPH AVAILABLE AT THIS TIME
USES: Consult your pharmacist.
HOW TO USE: Consult your pharmacist.
SIDE EFFECTS: Consult your pharmacist.In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
PRECAUTIONS: Consult your pharmacist.
DRUG INTERACTIONS: Consult your pharmacist.Keep a list of all your medications with you, and share the list with your doctor and pharmacist.
OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.
NOTES: No monograph available at this time.
MISSED DOSE: Consult your pharmacist.
STORAGE: Consult your pharmacist.Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.
Information last revised July 2016. Copyright(c) 2023 First Databank, Inc.
IMPORTANT: HOW TO USE THIS INFORMATION: This is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate for you. This information is not individual medical advice and does not substitute for the advice of your health care professional. Always ask your health care professional for complete information about this product and your specific health needs.
Formulary
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