telmisartan/amlodipine (Rx)

Hypertension

Initiate with 40 mg/5 mg or 80 mg/5 mg PO qDay, OR

Substitute for individually titrated components

May increase dose after at least 2 weeks, not to exceed 80 mg/10 mg qDay

Dosage range: Telmisartan 20-80 mg/amlodipine 2.5-10 mg PO qDay

May be adminsitered concomitantly with other antihypertensive agents

Dosage Modification

Severe hepatic impairment: Not Titrate slowly; initiate with lowest dose possible

Renal Impairment

• Mild to moderate: Dose adjustment not required
• Severe: Titrate slowly

Hepatic Impairment

• Initiate with decreased dose containing 2.5 mg amlodipine; titrate slowly

Safety and efficacy not established

Not recommended as initial therapy for patients >75 years of age

Initiate with decreased dose containing 2.5 mg amlodipine; titrate slowly

Contraindicated (5)

• aliskiren

  telmisartan decreases effects of aliskiren by Other (see comment). Contraindicated. Comment: Aliskiren use contraindicated with ARBs in patients with diabetes; avoid coadministration with ARBs if GFR. In patients who are elderly, volume-depleted (including those on diuretic therapy), or with compromised renal function, coadministration of ARBS with drugs that affect RAAS may increase the risk of renal impairment (including acute renal failure) and cause loss of antihypertensive effect. Monitor renal function periodically.

• dantrolene

  dantrolene, amlodipine. Either increases toxicity of the other by Mechanism: pharmacodynamic synergism. Contraindicated. Rare incidence of cardiovascular collapse and marked hyperkalemia observed when coadministered; may be higher risk with nondihydropyridine calcium channel blockers.

• elagolix

  telmisartan will increase the level or effect of elagolix by Other (see comment). Contraindicated. Concomitant use of elagolix and strong OATP1B1 inhibitors is contraindicated.

• fezolinetant

  amlodipine will increase the level or effect of fezolinetant by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Fezolinetant AUC and peak plasma concentration are increased if coadministered with drugs that are weak, moderate, or strong CYP1A2 inhibitors

• sparsentan

  sparsentan, telmisartan. Either increases toxicity of the other by pharmacodynamic synergism. Contraindicated. Coadministration of ARBs with sparsentan is associated with increased risks of hypotension, syncope, hyperkalemia, and changes in renal function (eg, acute renal failure).

Serious - Use Alternative (33)

• abametapir

  abametapir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.

• apalutamide

  apalutamide will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.

• baricitinib

  telmisartan will increase the level or effect of baricitinib by decreasing elimination. Avoid or Use Alternate Drug. Coadministration of baricitinib with strong organic anion transporter 3 (OAT3) inhibitors is not recommended.

• benazepril

  telmisartan, benazepril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• captopril

  telmisartan, captopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• chloramphenicol

  chloramphenicol will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• chloroquine

  chloroquine will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• conivaptan

  conivaptan will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Calcium channel blockers with depressant effects on the sinus and AV nodes could potentiate dronedarone's effects on conduction. Give a low dose of calcium channel blockers initially and increase only ECG is reviewed and tolerated.

• diltiazem

  diltiazem will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Concomitant use with amlodipine and diltiazem reported an a 60% increase in amlodipine AUC. Monitor increased effects and toxicities (eg, bradycardia, sinus arrest, decreased cardiac output) if amiodarone is concomitantly used with nondihydropyridine calcium channel blocker (ie, diltiazem).

• eluxadoline

  telmisartan increases levels of eluxadoline by increasing metabolism. Avoid or Use Alternate Drug. Decrease eluxadoline dose to 75 mg PO BID if coadministered with OATP1B1 inhibitors. .

• enalapril

  telmisartan, enalapril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• enzalutamide

  enzalutamide will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• fexinidazole

  fexinidazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

• fosinopril

  telmisartan, fosinopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• idelalisib

  idelalisib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substrates

• ivosidenib

  ivosidenib will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternate therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

• leniolisib

  leniolisib will increase the level or effect of telmisartan by Other (see comment). Avoid or Use Alternate Drug. Leniolisib, an OATP1B1 and OATP1B3 inhibitor, may increase systemic exposure of these substrates

• lisinopril

  telmisartan, lisinopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• lithium

  telmisartan increases toxicity of lithium by decreasing renal clearance. Avoid or Use Alternate Drug.

• lofexidine

  lofexidine, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid coadministration with other drugs that decrease pulse or blood pressure to mitigate risk of excessive bradycardia and hypotension.
  
  lofexidine, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid coadministration with other drugs that decrease pulse or blood pressure to mitigate risk of excessive bradycardia and hypotension.

• lonafarnib

  amlodipine will increase the level or effect of lonafarnib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration of lonafarnib (a sensitive CYP3A substrate) with weak CYP3A inhibitors is unavoidable, reduce to, or continue lonafarnib at starting dose. Closely monitor for arrhythmias and events (eg, syncope, heart palpitations) since lonafarnib effect on QT interval is unknown.
  
  lonafarnib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration with sensitive CYP3A substrates. If coadministration unavoidable, monitor for adverse reactions and reduce CYP3A substrate dose in accordance with product labeling.

• moexipril

  telmisartan, moexipril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• nifedipine

  nifedipine will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• perindopril

  telmisartan, perindopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• potassium phosphates, IV

  telmisartan and potassium phosphates, IV both increase serum potassium. Avoid or Use Alternate Drug.

• quinapril

  telmisartan, quinapril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• ramipril

  ramipril, telmisartan. Mechanism: unspecified interaction mechanism. Contraindicated. Increased incidence of clinically important renal dysfunction (death, doubling of serum creatinine, dialysis) compared with groups receiving either drug alone. .
  
  telmisartan, ramipril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• revefenacin

  telmisartan increases levels of revefenacin by Other (see comment). Avoid or Use Alternate Drug. Comment: OATP1B1 and OATP1B3 transport inhibitors may increase systemic exposure of revefenacin's active metabolite. Coadministration not recommended.

• simvastatin

  amlodipine increases levels of simvastatin by Other (see comment). Avoid or Use Alternate Drug. Comment: Benefits of combination therapy should be carefully weighed against the potential risks of combination. Potential for increased risk of myopathy/rhabdomyolysis. Limit simvastatin dose to no more than 20 mg/day when used concurrently.

• sulbactam/durlobactam

  telmisartan will increase the level or effect of sulbactam/durlobactam by Other (see comment). Avoid or Use Alternate Drug. Sulbactam is predicted to have active secretion by OATP1 as a significant portion of total clearance; therefore, inhibition of OAT1 may increase sulbactam plasma concentrations

• trandolapril

  telmisartan, trandolapril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• trofinetide

  trofinetide will increase the level or effect of telmisartan by Other (see comment). Avoid or Use Alternate Drug. Trofinetide (an OATP131 and OATP13B inhibitor) may increase plasma levels of OATP131 or OATP13B substrates. Avoid coadministration with sensitive substrates.

• voxelotor

  voxelotor will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

Monitor Closely (246)

• acebutolol

  telmisartan and acebutolol both increase serum potassium. Use Caution/Monitor.
  
  acebutolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  acebutolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• aceclofenac

  telmisartan and aceclofenac both increase serum potassium. Use Caution/Monitor.

• aldesleukin

  aldesleukin increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• acemetacin

  telmisartan and acemetacin both increase serum potassium. Use Caution/Monitor.

• albiglutide

  telmisartan increases effects of albiglutide by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• aldesleukin

  aldesleukin increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• alfuzosin

  alfuzosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• amifostine

  amifostine, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration with blood pressure lowering agents may increase the risk and severity of hypotension associated with amifostine. When amifostine is used at chemotherapeutic doses, withhold blood pressure lowering medications for 24 hr prior to amifostine; if blood pressure lowering medication cannot be withheld, do not administer amifostine.
  
  amifostine, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration with blood pressure lowering agents may increase the risk and severity of hypotension associated with amifostine. When amifostine is used at chemotherapeutic doses, withhold blood pressure lowering medications for 24 hr prior to amifostine; if blood pressure lowering medication cannot be withheld, do not administer amifostine.

• amiloride

  telmisartan and amiloride both increase serum potassium. Modify Therapy/Monitor Closely.

• asenapine

  asenapine and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• apalutamide

  apalutamide will decrease the level or effect of telmisartan by increasing elimination. Use Caution/Monitor. Apalutamide induces UGT and may decrease systemic exposure of drugs that are UGT substrates.

• aspirin

  telmisartan and aspirin both increase serum potassium. Use Caution/Monitor.
  
  aspirin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, aspirin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• aspirin rectal

  telmisartan and aspirin rectal both increase serum potassium. Use Caution/Monitor.

• aspirin/citric acid/sodium bicarbonate

  aspirin/citric acid/sodium bicarbonate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and aspirin/citric acid/sodium bicarbonate both increase serum potassium. Use Caution/Monitor.
  
  telmisartan, aspirin/citric acid/sodium bicarbonate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• atenolol

  atenolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  atenolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  telmisartan and atenolol both increase serum potassium. Use Caution/Monitor.

• atogepant

  telmisartan will increase the level or effect of atogepant by Other (see comment). Modify Therapy/Monitor Closely. Recommended dosage of atogepant (an OATP1B1 substrate) with concomitant use of OATP inhibitors is 10 mg or 30 mg qDay.
  
  amlodipine will increase the level or effect of atogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• atorvastatin

  telmisartan increases toxicity of atorvastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• avanafil

  avanafil increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• avanafil

  avanafil increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• avapritinib

  amlodipine will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• axitinib

  amlodipine increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• belzutifan

  belzutifan will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

• bendroflumethiazide

  telmisartan increases and bendroflumethiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• betaxolol

  telmisartan and betaxolol both increase serum potassium. Use Caution/Monitor.
  
  betaxolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  betaxolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• bisoprolol

  bisoprolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  bisoprolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and bisoprolol both increase serum potassium. Use Caution/Monitor.

• bosentan

  bosentan will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for decreased effects of amlodipine (CYP3A4 substrate) if bosentan is initiated/dose increased. Also, monitor toxicities of amlodipine if bosentan is discontinued/dose decreased.

• bretylium

  telmisartan, bretylium. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Each drug may cause hypotension.

• bretylium

  amlodipine, bretylium. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Each drug may cause hypotension.

• brimonidine

  brimonidine increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.

• bumetanide

  telmisartan increases and bumetanide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• butabarbital

  butabarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• butalbital

  butalbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• calcium acetate

  calcium acetate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium carbonate

  calcium carbonate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium chloride

  calcium chloride decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium citrate

  calcium citrate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium gluconate

  calcium gluconate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• canagliflozin

  telmisartan and canagliflozin both increase serum potassium. Use Caution/Monitor.

• carbamazepine

  carbamazepine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• carbenoxolone

  telmisartan increases and carbenoxolone decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• carbidopa

  carbidopa increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Therapy with carbidopa, given with or without levodopa or carbidopa-levodopa combination products, is started, dosage adjustment of the antihypertensive drug may be required.

• carvedilol

  carvedilol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  carvedilol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  telmisartan and carvedilol both increase serum potassium. Use Caution/Monitor.

• celecoxib

  telmisartan and celecoxib both increase serum potassium. Use Caution/Monitor.
  
  celecoxib decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, celecoxib. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• celiprolol

  celiprolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.

• celiprolol

  telmisartan and celiprolol both increase serum potassium. Use Caution/Monitor.
  
  celiprolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• cenobamate

  cenobamate will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

• ceritinib

  ceritinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• chlorothiazide

  telmisartan increases and chlorothiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• chlorthalidone

  telmisartan increases and chlorthalidone decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• choline magnesium trisalicylate

  telmisartan and choline magnesium trisalicylate both increase serum potassium. Use Caution/Monitor.
  
  choline magnesium trisalicylate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, choline magnesium trisalicylate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• clarithromycin

  clarithromycin will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased effect of calcium channel blockers may lead to hypotension, edema, decreased HR, and acute kidney injury due to reduced renal blood flow

• clevidipine

  amlodipine and clevidipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• cobicistat

  cobicistat will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• crizotinib

  crizotinib increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cyclopenthiazide

  telmisartan increases and cyclopenthiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• cyclosporine

  cyclosporine will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  amlodipine increases levels of cyclosporine by unspecified interaction mechanism. Modify Therapy/Monitor Closely. A prospective study in renal transplant recipients averaged a 40% increase in cyclosporine trough levels.

• dabrafenib

  dabrafenib will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• dalteparin

  dalteparin increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Low molecular weight heparins may suppress adrenal aldosterone secretion, which can potentially cause hyperkalemia.

• darunavir

  darunavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• deferasirox

  deferasirox will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dichlorphenamide

  dichlorphenamide and amlodipine both decrease serum potassium. Use Caution/Monitor.

• diclofenac

  telmisartan and diclofenac both increase serum potassium. Use Caution/Monitor.
  
  diclofenac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, diclofenac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• diflunisal

  telmisartan and diflunisal both increase serum potassium. Use Caution/Monitor.
  
  diflunisal decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, diflunisal. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• digoxin

  telmisartan and digoxin both increase serum potassium. Use Caution/Monitor.
  
  telmisartan increases levels of digoxin by unknown mechanism. Use Caution/Monitor.

• diltiazem

  amlodipine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• dopexamine

  telmisartan increases and dopexamine decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• doxazosin

  doxazosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• dronedarone

  dronedarone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Calcium channel blockers with depressant effects on the sinus and AV nodes could potentiate dronedarone's effects on conduction. Give a low dose of calcium channel blockers initially and increase only ECG is reviewed and tolerated.

• drospirenone

  telmisartan and drospirenone both increase serum potassium. Modify Therapy/Monitor Closely.

• efavirenz

  efavirenz will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• elagolix

  elagolix will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Cobicistat is a CYP3A4 inhibitor; contraindicated with CYP3A4 substrates for which elevated plasma concentrations are associated with serious and/or life-threatening events.

• encorafenib

  encorafenib, amlodipine. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Encorafenib both inhibits and induces CYP3A4 at clinically relevant plasma concentrations. Coadministration of encorafenib with sensitive CYP3A4 substrates may result in increased toxicity or decreased efficacy of these agents.
  
  encorafenib will increase the level or effect of telmisartan by Other (see comment). Modify Therapy/Monitor Closely. Encorafenib (a OATP1B3 inhibitor) may increase the concentration and toxicities of OATP1B3 substrates. Closely monitor for signs and symptoms of increased exposure and consider adjusting the dose of these substrates.

• enoxaparin

  enoxaparin increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Low molecular weight heparins may suppress adrenal aldosterone secretion, which can potentially cause hyperkalemia.

• erythromycin base

  erythromycin base will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• eplerenone

  telmisartan, eplerenone. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of hyperkalemia.

• erythromycin ethylsuccinate

  erythromycin ethylsuccinate will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin lactobionate

  erythromycin lactobionate will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin stearate

  erythromycin stearate will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• eslicarbazepine acetate

  eslicarbazepine acetate will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• esmolol

  esmolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  telmisartan and esmolol both increase serum potassium. Use Caution/Monitor.
  
  esmolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• ethacrynic acid

  telmisartan increases and ethacrynic acid decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• fedratinib

  fedratinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.

• etodolac

  telmisartan and etodolac both increase serum potassium. Use Caution/Monitor.
  
  etodolac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, etodolac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• exenatide injectable solution

  telmisartan increases effects of exenatide injectable solution by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• exenatide injectable suspension

  telmisartan increases effects of exenatide injectable suspension by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• felodipine

  amlodipine and felodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• fenbufen

  telmisartan and fenbufen both increase serum potassium. Use Caution/Monitor.

• fenoprofen

  telmisartan and fenoprofen both increase serum potassium. Use Caution/Monitor.
  
  fenoprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, fenoprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• finerenone

  amlodipine will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor serum potassium during initiation and dosage adjustment of either finererone or weak CYP3A4 inhibitors. Adjust finererone dosage as needed.

• flibanserin

  amlodipine will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased flibanserin adverse effects may occur if coadministered with multiple weak CYP3A4 inhibitors.

• fluconazole

  fluconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• flurbiprofen

  telmisartan and flurbiprofen both increase serum potassium. Use Caution/Monitor.
  
  flurbiprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, flurbiprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• fluvastatin

  telmisartan increases toxicity of fluvastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• fosamprenavir

  fosamprenavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fosphenytoin

  fosphenytoin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fostemsavir

  fostemsavir will increase the level or effect of telmisartan by Other (see comment). Modify Therapy/Monitor Closely. Fostemsavir inhibits OATP1B1/3 transporter. If possible, avoid coadministration or modify dose of OATP1B1/3 substrates coadministered with fostemsavir.

• furosemide

  telmisartan increases and furosemide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• gentamicin

  telmisartan increases and gentamicin decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• glecaprevir/pibrentasvir

  telmisartan will increase the level or effect of glecaprevir/pibrentasvir by decreasing metabolism. Use Caution/Monitor. Caution when coadministering glecaprevir/pibrentasvir with OATP1B1/OATP1B3 inhibitors
  
  glecaprevir/pibrentasvir will increase the level or effect of telmisartan by Other (see comment). Use Caution/Monitor. Coadministration with glecaprevir/pibrentasvir may increase plasma concentration of drugs that are substrates of OATP1B1 or OATP1B3

• griseofulvin

  griseofulvin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• heparin

  heparin increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Low molecular weight heparins may suppress adrenal aldosterone secretion, which can potentially cause hyperkalemia.

• hydrochlorothiazide

  telmisartan increases and hydrochlorothiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• ibuprofen

  telmisartan and ibuprofen both increase serum potassium. Use Caution/Monitor.
  
  ibuprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, ibuprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• ibuprofen IV

  ibuprofen IV decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and ibuprofen IV both increase serum potassium. Use Caution/Monitor.
  
  telmisartan, ibuprofen IV. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• iloperidone

  iloperidone and amlodipine both increase additive vasodilation. Use Caution/Monitor. Calcium channel blockers with iloperidone may potentiate the hypotensive effects.

• indapamide

  telmisartan increases and indapamide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• indomethacin

  telmisartan and indomethacin both increase serum potassium. Use Caution/Monitor.
  
  indomethacin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, indomethacin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• insulin aspart

  telmisartan increases effects of insulin aspart by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin aspart protamine/insulin aspart

  telmisartan increases effects of insulin aspart protamine/insulin aspart by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin degludec

  telmisartan, insulin degludec. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.
  
  telmisartan increases effects of insulin degludec by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin degludec/insulin aspart

  telmisartan, insulin degludec/insulin aspart. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.

• insulin detemir

  telmisartan increases effects of insulin detemir by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin glargine

  telmisartan increases effects of insulin glargine by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin glulisine

  telmisartan increases effects of insulin glulisine by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin inhaled

  telmisartan, insulin inhaled. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.
  
  telmisartan increases effects of insulin inhaled by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin isophane human/insulin regular human

  telmisartan increases effects of insulin isophane human/insulin regular human by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin lispro

  telmisartan increases effects of insulin lispro by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin lispro protamine/insulin lispro

  telmisartan increases effects of insulin lispro protamine/insulin lispro by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin NPH

  telmisartan increases effects of insulin NPH by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin regular human

  telmisartan increases effects of insulin regular human by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• irbesartan

  irbesartan and telmisartan both increase serum potassium. Use Caution/Monitor.

• isavuconazonium sulfate

  amlodipine will increase the level or effect of isavuconazonium sulfate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• isradipine

  amlodipine and isradipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• istradefylline

  istradefylline will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.

• itraconazole

  itraconazole will increase the level or effect of amlodipine by Other (see comment). Modify Therapy/Monitor Closely. CCBs elicit negative inotropic effects which may be additive to those of itraconazole; additionally, itraconazole can inhibit the metabolism of calcium channel blockers. Monitor for adverse reactions. Concomitant drug dose reduction may be necessary.

• ketoconazole

  ketoconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ketoprofen

  telmisartan and ketoprofen both increase serum potassium. Use Caution/Monitor.
  
  ketoprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, ketoprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• ketorolac

  telmisartan and ketorolac both increase serum potassium. Use Caution/Monitor.
  
  ketorolac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, ketorolac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• ketorolac intranasal

  telmisartan and ketorolac intranasal both increase serum potassium. Use Caution/Monitor.
  
  ketorolac intranasal decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, ketorolac intranasal. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• labetalol

  telmisartan and labetalol both increase serum potassium. Use Caution/Monitor.
  
  labetalol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  labetalol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• lemborexant

  amlodipine will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Lower nightly dose of lemborexant recommended if coadministered with weak CYP3A4 inhibitors. See drug monograph for specific dosage modification.

• letermovir

  telmisartan increases levels of letermovir by decreasing metabolism. Use Caution/Monitor. Coadminstration of letermovir, an OATP1B1/3 substrate, with OATP1B1/3 inhibitors may increase letermovir plasma concentrations.
  
  letermovir increases levels of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Letermovir, an OATP1B1/3 inhibitor may increase plasma concentrations of coadministered OATP1B1/3 substrates.

• lenacapavir

  lenacapavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lencapavir may increase CYP3A4 substrates initiated within 9 months after last SC dose of lenacapavir, which may increase potential risk of adverse reactions of CYP3A4 substrates.

• lesinurad

  lesinurad decreases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• letermovir

  letermovir increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• levodopa

  levodopa increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Consider decreasing dosage of antihypertensive agent.
  
  levodopa increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Consider decreasing dosage of antihypertensive agent.

• levoketoconazole

  levoketoconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• liraglutide

  telmisartan increases effects of liraglutide by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• lomitapide

  amlodipine increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lomitapide dose should not exceed 30 mg/day.

• lopinavir

  lopinavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lorlatinib

  lorlatinib will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lornoxicam

  telmisartan and lornoxicam both increase serum potassium. Use Caution/Monitor.

• lurasidone

  lurasidone increases effects of amlodipine by Other (see comment). Use Caution/Monitor. Comment: Potential for increased risk of hypotension with concurrent use. Monitor blood pressure and adjust dose of antihypertensive agent as needed.
  
  lurasidone increases effects of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Potential for increased risk of hypotension with concurrent use. Monitor blood pressure and adjust dose of antihypertensive agent as needed.

• magnesium supplement

  magnesium supplement, amlodipine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Calcium channel blockers may increase toxic effects of magnesium; magnesium may increase hypotensive effects of calcium channel blockers.

• maitake

  maitake increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.

• maraviroc

  maraviroc, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of orthostatic hypotension.
  
  maraviroc, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of orthostatic hypotension.

• mavacamten

  telmisartan will increase the level or effect of mavacamten by affecting hepatic enzyme CYP2C19 metabolism. Modify Therapy/Monitor Closely. Inititiation of weak CYP2C19 inhibitors may require decreased mavacamten dose.

• mefloquine

  mefloquine increases levels of amlodipine by decreasing metabolism. Use Caution/Monitor. Risk of arrhythmia.

• meclofenamate

  meclofenamate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and meclofenamate both increase serum potassium. Use Caution/Monitor.
  
  telmisartan, meclofenamate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• mefenamic acid

  telmisartan and mefenamic acid both increase serum potassium. Use Caution/Monitor.
  
  mefenamic acid decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, mefenamic acid. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• meloxicam

  telmisartan and meloxicam both increase serum potassium. Use Caution/Monitor.
  
  meloxicam decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, meloxicam. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• metformin

  amlodipine 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.

• methyclothiazide

  telmisartan increases and methyclothiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor. .

• methylphenidate

  methylphenidate will decrease the level or effect of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor. Methylphenidate may diminish antihypertensive effects. Monitor BP.
  
  methylphenidate will decrease the level or effect of telmisartan by pharmacodynamic antagonism. Use Caution/Monitor. Methylphenidate may diminish antihypertensive effects. Monitor BP.

• methylphenidate transdermal

  methylphenidate transdermal decreases effects of telmisartan by anti-hypertensive channel blocking. Use Caution/Monitor.

• midazolam intranasal

  amlodipine will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of mild CYP3A4 inhibitors with midazolam intranasal may cause higher midazolam systemic exposure, which may prolong sedation.

• metolazone

  telmisartan increases and metolazone decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• metoprolol

  telmisartan and metoprolol both increase serum potassium. Use Caution/Monitor.
  
  metoprolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• mifepristone

  mifepristone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mitotane

  mitotane decreases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• moxisylyte

  moxisylyte and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• mycophenolate

  telmisartan will decrease the level or effect of mycophenolate by Other (see comment). Use Caution/Monitor. Concommitant administration with telmisartan may result in significant decrease in mycophenolic acid (MPA) concentrations; telmisartan changes MPA?s elimination by enhancing PPAR gamma (peroxisome proliferator-activated receptor gamma) expression, which in turn results in an enhanced UGT1A9 expression and activity

• nabumetone

  telmisartan and nabumetone both increase serum potassium. Use Caution/Monitor.
  
  nabumetone decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, nabumetone. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• nadolol

  nadolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and nadolol both increase serum potassium. Use Caution/Monitor.
  
  nadolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• naproxen

  telmisartan and naproxen both increase serum potassium. Use Caution/Monitor.
  
  naproxen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, naproxen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• nebivolol

  nebivolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.

• nebivolol

  telmisartan and nebivolol both increase serum potassium. Use Caution/Monitor.
  
  nebivolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• nefazodone

  nefazodone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• nevirapine

  nevirapine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nicardipine

  amlodipine and nicardipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• nifedipine

  amlodipine and nifedipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• nilotinib

  nilotinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nirmatrelvir

  nirmatrelvir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce amlodipine dose by 50% during coadministration and for 3 more days after the last nirmatrelvir/ritonavir dose.

• nirmatrelvir/ritonavir

  nirmatrelvir/ritonavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce amlodipine dose by 50% during coadministration and for 3 more days after the last nirmatrelvir/ritonavir dose.

• nisoldipine

  amlodipine and nisoldipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• nitroglycerin rectal

  nitroglycerin rectal, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Observe for possible additive hypotensive effects during concomitant use. .
  
  nitroglycerin rectal, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Marked orthostatic hypotension has been reported when calcium channel blockers and organic nitrates were used concomitantly. Observe for possible additive hypotensive effects during concomitant use. .

• nitroglycerin sublingual

  amlodipine, nitroglycerin sublingual. Either increases toxicity of the other by additive vasodilation. Modify Therapy/Monitor Closely. Marked orthostatic hypotension reported with concomitant use.

• oxaprozin

  telmisartan and oxaprozin both increase serum potassium. Use Caution/Monitor.
  
  oxaprozin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, oxaprozin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• nitroprusside sodium

  amlodipine increases effects of nitroprusside sodium by pharmacodynamic synergism. Use Caution/Monitor.

• ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC)

  ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease dose of calcium channel blocker; dose of amlodipine should be decreased by at least 50%; clinical monitoring of patients is recommended for edema and/or signs and symptoms of hypotension. if such events occur, consider further dose reduction of calcium channel blocker or switching to alternative to calcium channel blocker
  
  ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) will increase the level or effect of amlodipine by altering metabolism. Modify Therapy/Monitor Closely. Decrease dose of calcium channel blocker; dose of amlodipine should be decreased by at least 50%; clinical monitoring of patients is recommended for edema and/or signs and symptoms of hypotension. if such events occur, consider further dose reduction of calcium channel blocker or switching to alternative to calcium channel blocker

• parecoxib

  telmisartan and parecoxib both increase serum potassium. Use Caution/Monitor.

• patiromer

  patiromer will decrease the level or effect of telmisartan by cation binding in GI tract. Modify Therapy/Monitor Closely. Separate administration by at least 3 hr from patiromer

• penbutolol

  penbutolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  penbutolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and penbutolol both increase serum potassium. Use Caution/Monitor.

• pentobarbital

  pentobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• pindolol

  telmisartan and pindolol both increase serum potassium. Use Caution/Monitor.
  
  pindolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• phenobarbital

  phenobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• phenoxybenzamine

  phenoxybenzamine and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• phentolamine

  phentolamine and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• phenytoin

  amlodipine will increase the level or effect of phenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• pindolol

  pindolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• piroxicam

  telmisartan and piroxicam both increase serum potassium. Use Caution/Monitor.
  
  piroxicam decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, piroxicam. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• pitavastatin

  telmisartan increases toxicity of pitavastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• posaconazole

  posaconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• potassium acid phosphate

  telmisartan and potassium acid phosphate both increase serum potassium. Use Caution/Monitor.

• potassium chloride

  telmisartan and potassium chloride both increase serum potassium. Use Caution/Monitor.

• potassium citrate

  telmisartan and potassium citrate both increase serum potassium. Use Caution/Monitor.

• potassium citrate/citric acid

  telmisartan and potassium citrate/citric acid both increase serum potassium. Modify Therapy/Monitor Closely.

• potassium iodide

  potassium iodide and telmisartan both increase serum potassium. Use Caution/Monitor. Potassium salts may increase the hyperkalemic effects of ARBs; the effect may be the result of aldosterone suppression in patients receiving ARBs.

• pravastatin

  telmisartan increases toxicity of pravastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• prazosin

  prazosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• primidone

  primidone will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• propranolol

  telmisartan and propranolol both increase serum potassium. Use Caution/Monitor.
  
  propranolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  propranolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• ribociclib

  ribociclib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• sacubitril/valsartan

  telmisartan and sacubitril/valsartan both increase serum potassium. Use Caution/Monitor.

• rifabutin

  rifabutin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifampin

  rifampin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifapentine

  rifapentine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ritonavir

  ritonavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rucaparib

  rucaparib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• salicylates (non-asa)

  telmisartan and salicylates (non-asa) both increase serum potassium. Use Caution/Monitor.

• salsalate

  telmisartan and salsalate both increase serum potassium. Use Caution/Monitor.
  
  salsalate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, salsalate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• saquinavir

  saquinavir increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Potential for increased toxicity. .

• silodosin

  silodosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• sodium sulfate/?magnesium sulfate/potassium chloride

  amlodipine, sodium sulfate/?magnesium sulfate/potassium chloride. Either increases effects of the other by unknown mechanism. Use Caution/Monitor. Monitor for hypotension or muscle weakness in patients receiving calcium channel blockers with elevated serum magnesium concentrations.
  
  sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.

• sodium sulfate/potassium sulfate/magnesium sulfate

  sodium sulfate/potassium sulfate/magnesium sulfate increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.
  
  amlodipine, sodium sulfate/potassium sulfate/magnesium sulfate. Either increases effects of the other by unknown mechanism. Use Caution/Monitor. Monitor for hypotension or muscle weakness in patients receiving calcium channel blockers with elevated serum magnesium concentrations.

• sotalol

  telmisartan and sotalol both increase serum potassium. Use Caution/Monitor.
  
  sotalol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  sotalol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• St John's Wort

  St John's Wort will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• spironolactone

  telmisartan and spironolactone both increase serum potassium. Modify Therapy/Monitor Closely.

• stiripentol

  stiripentol, amlodipine. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.

• sulfasalazine

  telmisartan and sulfasalazine both increase serum potassium. Use Caution/Monitor.
  
  sulfasalazine decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, sulfasalazine. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• sulindac

  telmisartan and sulindac both increase serum potassium. Use Caution/Monitor.
  
  sulindac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, sulindac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• synthetic human angiotensin II

  telmisartan decreases effects of synthetic human angiotensin II by pharmacodynamic antagonism. Use Caution/Monitor.

• tacrolimus

  amlodipine will increase the level or effect of tacrolimus by unspecified interaction mechanism. Modify Therapy/Monitor Closely. Adjust dose when appropriate.

• tadalafil

  tadalafil increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.
  
  tadalafil increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• tazemetostat

  tazemetostat will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  amlodipine will decrease the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• terbutaline

  telmisartan increases and terbutaline decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• tecovirimat

  tecovirimat will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• temsirolimus

  amlodipine increases toxicity of temsirolimus by Other (see comment). Use Caution/Monitor. Comment: Combination of mTOR inhibitors with calcium channel blockers increases risk of angioedema.

• terazosin

  terazosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• timolol

  timolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and timolol both increase serum potassium. Use Caution/Monitor.
  
  timolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• tinidazole

  amlodipine will increase the level or effect of tinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tizanidine

  tizanidine increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• tipranavir

  tipranavir increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Potential for increased toxicity. Tipranavir is used with ritonavir (boosted therapy) which is a potent CYP3A4 inhibitor.

• tolfenamic acid

  telmisartan and tolfenamic acid both increase serum potassium. Use Caution/Monitor.

• tolmetin

  telmisartan and tolmetin both increase serum potassium. Use Caution/Monitor.
  
  tolmetin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan, tolmetin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.

• tolvaptan

  telmisartan and tolvaptan both increase serum potassium. Use Caution/Monitor.

• torsemide

  telmisartan increases and torsemide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• treprostinil

  treprostinil increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.

• triamterene

  telmisartan and triamterene both increase serum potassium. Modify Therapy/Monitor Closely.

• trimagnesium citrate anhydrous

  trimagnesium citrate anhydrous, amlodipine. Either increases effects of the other by Other (see comment). Use Caution/Monitor. Comment: Possible additive effect of magnesium and calcium channel blockers on reduction of ionic calcium may increase risk of hypotension or muscle weakness.

• trimethoprim

  trimethoprim and telmisartan both increase serum potassium. Use Caution/Monitor. Trimethoprim decreases urinary potassium excretion. May cause hyperkalemia, particularly with high doses, renal insufficiency, or when combined with other drugs that cause hyperkalemia.

• verapamil

  amlodipine and verapamil both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• voclosporin

  voclosporin and telmisartan both increase serum potassium. Use Caution/Monitor.
  
  voclosporin, telmisartan. Either increases toxicity of the other by nephrotoxicity and/or ototoxicity. Modify Therapy/Monitor Closely. Coadministration with drugs associated with nephrotoxicity may increase the risk for acute and/or chronic nephrotoxicity.

• voriconazole

  voriconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  voriconazole increases levels of amlodipine by decreasing metabolism. Use Caution/Monitor.

• xipamide

  xipamide increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor.
  
  xipamide increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.

Minor (50)

• acetazolamide

  acetazolamide will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• agrimony

  agrimony increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.
  
  agrimony increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• amobarbital

  amobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cornsilk

  cornsilk increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.

• anastrozole

  anastrozole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aprepitant

  aprepitant will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• armodafinil

  armodafinil will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• artemether/lumefantrine

  artemether/lumefantrine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atazanavir

  atazanavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atracurium

  amlodipine increases effects of atracurium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• brimonidine

  brimonidine increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• cisatracurium

  amlodipine increases effects of cisatracurium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• cornsilk

  cornsilk increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• cyclophosphamide

  cyclophosphamide will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dasatinib

  dasatinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dexamethasone

  dexamethasone will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• DHEA, herbal

  DHEA, herbal will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• entecavir

  telmisartan, entecavir. Either increases effects of the other by decreasing renal clearance. Minor/Significance Unknown. Coadministration with drugs that reduce renal function or compete for active tubular secretion may increase serum concentrations of either entecavir or the coadministered drug.

• etravirine

  etravirine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fo-ti

  fo-ti increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• food

  food decreases levels of telmisartan by inhibition of GI absorption. Applies only to oral form of both agents. Minor/Significance Unknown.

• forskolin

  forskolin increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• fosaprepitant

  fosaprepitant will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• grapefruit

  grapefruit will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• hydrocortisone

  hydrocortisone will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• incobotulinumtoxinA

  amlodipine increases effects of incobotulinumtoxinA by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• larotrectinib

  larotrectinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lithium

  amlodipine increases toxicity of lithium by pharmacodynamic synergism. Minor/Significance Unknown. Increased risk of neurotoxicity.

• maitake

  maitake increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• metipranolol ophthalmic

  metipranolol ophthalmic increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• nelfinavir

  nelfinavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• noni juice

  telmisartan and noni juice both increase serum potassium. Minor/Significance Unknown.

• octacosanol

  octacosanol increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.
  
  octacosanol increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.

• onabotulinumtoxinA

  amlodipine increases effects of onabotulinumtoxinA by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• reishi

  reishi increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.

• oxcarbazepine

  oxcarbazepine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pancuronium

  amlodipine increases effects of pancuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• porfimer

  amlodipine decreases levels of porfimer by unspecified interaction mechanism. Minor/Significance Unknown.

• quinupristin/dalfopristin

  quinupristin/dalfopristin will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rapacuronium

  amlodipine increases effects of rapacuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• reishi

  reishi increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• rocuronium

  amlodipine increases effects of rocuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• rufinamide

  rufinamide will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib

  amlodipine will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib topical

  amlodipine will increase the level or effect of ruxolitinib topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• secobarbital

  secobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• shepherd's purse

  shepherd's purse, telmisartan. Other (see comment). Minor/Significance Unknown. Comment: Theoretically, shepherd's purse may interfere with BP control.
  
  shepherd's purse, amlodipine. Other (see comment). Minor/Significance Unknown. Comment: Theoretically, shepherd's purse may interfere with BP control.

• simvastatin

  telmisartan increases toxicity of simvastatin by Other (see comment). Minor/Significance Unknown. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• succinylcholine

  amlodipine increases effects of succinylcholine by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• tizanidine

  tizanidine increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypotension.

• abametapir

  Serious - Use Alternative (1)abametapir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.

• acebutolol

  Monitor Closely (3)telmisartan and acebutolol both increase serum potassium. Use Caution/Monitor.
  
  acebutolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  acebutolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• aceclofenac

  Monitor Closely (1)telmisartan and aceclofenac both increase serum potassium. Use Caution/Monitor.

• acemetacin

  Monitor Closely (1)telmisartan and acemetacin both increase serum potassium. Use Caution/Monitor.

• acetazolamide

  Minor (1)acetazolamide will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• agrimony

  Minor (2)agrimony increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.
  
  agrimony increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• albiglutide

  Monitor Closely (1)telmisartan increases effects of albiglutide by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• aldesleukin

  Monitor Closely (2)aldesleukin increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.
  
  aldesleukin increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• alfuzosin

  Monitor Closely (1)alfuzosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• aliskiren

  Contraindicated (1)telmisartan decreases effects of aliskiren by Other (see comment). Contraindicated. Comment: Aliskiren use contraindicated with ARBs in patients with diabetes; avoid coadministration with ARBs if GFR. In patients who are elderly, volume-depleted (including those on diuretic therapy), or with compromised renal function, coadministration of ARBS with drugs that affect RAAS may increase the risk of renal impairment (including acute renal failure) and cause loss of antihypertensive effect. Monitor renal function periodically.

• amifostine

  Monitor Closely (2)amifostine, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration with blood pressure lowering agents may increase the risk and severity of hypotension associated with amifostine. When amifostine is used at chemotherapeutic doses, withhold blood pressure lowering medications for 24 hr prior to amifostine; if blood pressure lowering medication cannot be withheld, do not administer amifostine.
  
  amifostine, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration with blood pressure lowering agents may increase the risk and severity of hypotension associated with amifostine. When amifostine is used at chemotherapeutic doses, withhold blood pressure lowering medications for 24 hr prior to amifostine; if blood pressure lowering medication cannot be withheld, do not administer amifostine.

• amiloride

  Monitor Closely (1)telmisartan and amiloride both increase serum potassium. Modify Therapy/Monitor Closely.

• amobarbital

  Minor (1)amobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• anastrozole

  Minor (1)anastrozole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apalutamide

  Monitor Closely (1)apalutamide will decrease the level or effect of telmisartan by increasing elimination. Use Caution/Monitor. Apalutamide induces UGT and may decrease systemic exposure of drugs that are UGT substrates.Serious - Use Alternative (1)apalutamide will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.

• aprepitant

  Minor (1)aprepitant will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• armodafinil

  Minor (1)armodafinil will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• artemether/lumefantrine

  Minor (1)artemether/lumefantrine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• asenapine

  Monitor Closely (1)asenapine and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• aspirin

  Monitor Closely (3)telmisartan, aspirin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  aspirin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and aspirin both increase serum potassium. Use Caution/Monitor.

• aspirin rectal

  Monitor Closely (1)telmisartan and aspirin rectal both increase serum potassium. Use Caution/Monitor.

• aspirin/citric acid/sodium bicarbonate

  Monitor Closely (3)telmisartan, aspirin/citric acid/sodium bicarbonate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  aspirin/citric acid/sodium bicarbonate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and aspirin/citric acid/sodium bicarbonate both increase serum potassium. Use Caution/Monitor.

• atazanavir

  Minor (1)atazanavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atenolol

  Monitor Closely (3)atenolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  atenolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  telmisartan and atenolol both increase serum potassium. Use Caution/Monitor.

• atogepant

  Monitor Closely (2)telmisartan will increase the level or effect of atogepant by Other (see comment). Modify Therapy/Monitor Closely. Recommended dosage of atogepant (an OATP1B1 substrate) with concomitant use of OATP inhibitors is 10 mg or 30 mg qDay.
  
  amlodipine will increase the level or effect of atogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• atorvastatin

  Monitor Closely (1)telmisartan increases toxicity of atorvastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• atracurium

  Minor (1)amlodipine increases effects of atracurium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• avanafil

  Monitor Closely (2)avanafil increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.
  
  avanafil increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• avapritinib

  Monitor Closely (1)amlodipine will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• axitinib

  Monitor Closely (1)amlodipine increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• baricitinib

  Serious - Use Alternative (1)telmisartan will increase the level or effect of baricitinib by decreasing elimination. Avoid or Use Alternate Drug. Coadministration of baricitinib with strong organic anion transporter 3 (OAT3) inhibitors is not recommended.

• belzutifan

  Monitor Closely (1)belzutifan will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

• benazepril

  Serious - Use Alternative (1)telmisartan, benazepril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• bendroflumethiazide

  Monitor Closely (1)telmisartan increases and bendroflumethiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• betaxolol

  Monitor Closely (3)telmisartan and betaxolol both increase serum potassium. Use Caution/Monitor.
  
  betaxolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  betaxolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• bisoprolol

  Monitor Closely (3)bisoprolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  bisoprolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and bisoprolol both increase serum potassium. Use Caution/Monitor.

• bosentan

  Monitor Closely (1)bosentan will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for decreased effects of amlodipine (CYP3A4 substrate) if bosentan is initiated/dose increased. Also, monitor toxicities of amlodipine if bosentan is discontinued/dose decreased.

• bretylium

  Monitor Closely (2)telmisartan, bretylium. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Each drug may cause hypotension.
  
  amlodipine, bretylium. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Each drug may cause hypotension.

• brimonidine

  Monitor Closely (1)brimonidine increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.Minor (1)brimonidine increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• bumetanide

  Monitor Closely (1)telmisartan increases and bumetanide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• butabarbital

  Monitor Closely (1)butabarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• butalbital

  Monitor Closely (1)butalbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• calcium acetate

  Monitor Closely (1)calcium acetate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium carbonate

  Monitor Closely (1)calcium carbonate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium chloride

  Monitor Closely (1)calcium chloride decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium citrate

  Monitor Closely (1)calcium citrate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• calcium gluconate

  Monitor Closely (1)calcium gluconate decreases effects of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor.

• canagliflozin

  Monitor Closely (1)telmisartan and canagliflozin both increase serum potassium. Use Caution/Monitor.

• captopril

  Serious - Use Alternative (1)telmisartan, captopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• carbamazepine

  Monitor Closely (1)carbamazepine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• carbenoxolone

  Monitor Closely (1)telmisartan increases and carbenoxolone decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• carbidopa

  Monitor Closely (1)carbidopa increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Therapy with carbidopa, given with or without levodopa or carbidopa-levodopa combination products, is started, dosage adjustment of the antihypertensive drug may be required.

• carvedilol

  Monitor Closely (3)carvedilol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  carvedilol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  telmisartan and carvedilol both increase serum potassium. Use Caution/Monitor.

• celecoxib

  Monitor Closely (3)telmisartan, celecoxib. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  celecoxib decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and celecoxib both increase serum potassium. Use Caution/Monitor.

• celiprolol

  Monitor Closely (3)celiprolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  celiprolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and celiprolol both increase serum potassium. Use Caution/Monitor.

• cenobamate

  Monitor Closely (1)cenobamate will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

• ceritinib

  Monitor Closely (1)ceritinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• chloramphenicol

  Serious - Use Alternative (1)chloramphenicol will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• chloroquine

  Serious - Use Alternative (1)chloroquine will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• chlorothiazide

  Monitor Closely (1)telmisartan increases and chlorothiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• chlorthalidone

  Monitor Closely (1)telmisartan increases and chlorthalidone decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• choline magnesium trisalicylate

  Monitor Closely (3)telmisartan, choline magnesium trisalicylate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  choline magnesium trisalicylate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and choline magnesium trisalicylate both increase serum potassium. Use Caution/Monitor.

• cisatracurium

  Minor (1)amlodipine increases effects of cisatracurium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• clarithromycin

  Monitor Closely (1)clarithromycin will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased effect of calcium channel blockers may lead to hypotension, edema, decreased HR, and acute kidney injury due to reduced renal blood flow

• clevidipine

  Monitor Closely (1)amlodipine and clevidipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• cobicistat

  Monitor Closely (1)cobicistat will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• conivaptan

  Serious - Use Alternative (1)conivaptan will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Calcium channel blockers with depressant effects on the sinus and AV nodes could potentiate dronedarone's effects on conduction. Give a low dose of calcium channel blockers initially and increase only ECG is reviewed and tolerated.

• cornsilk

  Minor (2)cornsilk increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.
  
  cornsilk increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.

• crizotinib

  Monitor Closely (1)crizotinib increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cyclopenthiazide

  Monitor Closely (1)telmisartan increases and cyclopenthiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• cyclophosphamide

  Minor (1)cyclophosphamide will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cyclosporine

  Monitor Closely (2)cyclosporine will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  amlodipine increases levels of cyclosporine by unspecified interaction mechanism. Modify Therapy/Monitor Closely. A prospective study in renal transplant recipients averaged a 40% increase in cyclosporine trough levels.

• dabrafenib

  Monitor Closely (1)dabrafenib will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• dalteparin

  Monitor Closely (1)dalteparin increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Low molecular weight heparins may suppress adrenal aldosterone secretion, which can potentially cause hyperkalemia.

• dantrolene

  Contraindicated (1)dantrolene, amlodipine. Either increases toxicity of the other by Mechanism: pharmacodynamic synergism. Contraindicated. Rare incidence of cardiovascular collapse and marked hyperkalemia observed when coadministered; may be higher risk with nondihydropyridine calcium channel blockers.

• darunavir

  Monitor Closely (1)darunavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dasatinib

  Minor (1)dasatinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• deferasirox

  Monitor Closely (1)deferasirox will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dexamethasone

  Minor (1)dexamethasone will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• DHEA, herbal

  Minor (1)DHEA, herbal will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dichlorphenamide

  Monitor Closely (1)dichlorphenamide and amlodipine both decrease serum potassium. Use Caution/Monitor.

• diclofenac

  Monitor Closely (3)telmisartan, diclofenac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  diclofenac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and diclofenac both increase serum potassium. Use Caution/Monitor.

• diflunisal

  Monitor Closely (3)telmisartan, diflunisal. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  diflunisal decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and diflunisal both increase serum potassium. Use Caution/Monitor.

• digoxin

  Monitor Closely (2)telmisartan increases levels of digoxin by unknown mechanism. Use Caution/Monitor.
  
  telmisartan and digoxin both increase serum potassium. Use Caution/Monitor.

• diltiazem

  Monitor Closely (1)amlodipine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.Serious - Use Alternative (1)diltiazem will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Concomitant use with amlodipine and diltiazem reported an a 60% increase in amlodipine AUC. Monitor increased effects and toxicities (eg, bradycardia, sinus arrest, decreased cardiac output) if amiodarone is concomitantly used with nondihydropyridine calcium channel blocker (ie, diltiazem).

• dopexamine

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

• doxazosin

  Monitor Closely (1)doxazosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• dronedarone

  Monitor Closely (1)dronedarone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Calcium channel blockers with depressant effects on the sinus and AV nodes could potentiate dronedarone's effects on conduction. Give a low dose of calcium channel blockers initially and increase only ECG is reviewed and tolerated.

• drospirenone

  Monitor Closely (1)telmisartan and drospirenone both increase serum potassium. Modify Therapy/Monitor Closely.

• efavirenz

  Monitor Closely (1)efavirenz will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• elagolix

  Contraindicated (1)telmisartan will increase the level or effect of elagolix by Other (see comment). Contraindicated. Concomitant use of elagolix and strong OATP1B1 inhibitors is contraindicated.Monitor Closely (1)elagolix will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.

• eluxadoline

  Serious - Use Alternative (1)telmisartan increases levels of eluxadoline by increasing metabolism. Avoid or Use Alternate Drug. Decrease eluxadoline dose to 75 mg PO BID if coadministered with OATP1B1 inhibitors. .

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  Monitor Closely (1)elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Cobicistat is a CYP3A4 inhibitor; contraindicated with CYP3A4 substrates for which elevated plasma concentrations are associated with serious and/or life-threatening events.

• enalapril

  Serious - Use Alternative (1)telmisartan, enalapril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• encorafenib

  Monitor Closely (2)encorafenib, amlodipine. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Encorafenib both inhibits and induces CYP3A4 at clinically relevant plasma concentrations. Coadministration of encorafenib with sensitive CYP3A4 substrates may result in increased toxicity or decreased efficacy of these agents.
  
  encorafenib will increase the level or effect of telmisartan by Other (see comment). Modify Therapy/Monitor Closely. Encorafenib (a OATP1B3 inhibitor) may increase the concentration and toxicities of OATP1B3 substrates. Closely monitor for signs and symptoms of increased exposure and consider adjusting the dose of these substrates.

• enoxaparin

  Monitor Closely (1)enoxaparin increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Low molecular weight heparins may suppress adrenal aldosterone secretion, which can potentially cause hyperkalemia.

• entecavir

  Minor (1)telmisartan, entecavir. Either increases effects of the other by decreasing renal clearance. Minor/Significance Unknown. Coadministration with drugs that reduce renal function or compete for active tubular secretion may increase serum concentrations of either entecavir or the coadministered drug.

• enzalutamide

  Serious - Use Alternative (1)enzalutamide will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• eplerenone

  Monitor Closely (1)telmisartan, eplerenone. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of hyperkalemia.

• erythromycin base

  Monitor Closely (1)erythromycin base will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin ethylsuccinate

  Monitor Closely (1)erythromycin ethylsuccinate will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin lactobionate

  Monitor Closely (1)erythromycin lactobionate will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin stearate

  Monitor Closely (1)erythromycin stearate will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• eslicarbazepine acetate

  Monitor Closely (1)eslicarbazepine acetate will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• esmolol

  Monitor Closely (3)esmolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  telmisartan and esmolol both increase serum potassium. Use Caution/Monitor.
  
  esmolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• ethacrynic acid

  Monitor Closely (1)telmisartan increases and ethacrynic acid decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• etodolac

  Monitor Closely (3)telmisartan, etodolac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  etodolac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and etodolac both increase serum potassium. Use Caution/Monitor.

• etravirine

  Minor (1)etravirine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• exenatide injectable solution

  Monitor Closely (1)telmisartan increases effects of exenatide injectable solution by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• exenatide injectable suspension

  Monitor Closely (1)telmisartan increases effects of exenatide injectable suspension by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• fedratinib

  Monitor Closely (1)fedratinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.

• felodipine

  Monitor Closely (1)amlodipine and felodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• fenbufen

  Monitor Closely (1)telmisartan and fenbufen both increase serum potassium. Use Caution/Monitor.

• fenoprofen

  Monitor Closely (3)telmisartan, fenoprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  fenoprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and fenoprofen both increase serum potassium. Use Caution/Monitor.

• fexinidazole

  Serious - Use Alternative (1)fexinidazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

• fezolinetant

  Contraindicated (1)amlodipine will increase the level or effect of fezolinetant by affecting hepatic enzyme CYP1A2 metabolism. Contraindicated. Fezolinetant AUC and peak plasma concentration are increased if coadministered with drugs that are weak, moderate, or strong CYP1A2 inhibitors

• finerenone

  Monitor Closely (1)amlodipine will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor serum potassium during initiation and dosage adjustment of either finererone or weak CYP3A4 inhibitors. Adjust finererone dosage as needed.

• flibanserin

  Monitor Closely (1)amlodipine will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased flibanserin adverse effects may occur if coadministered with multiple weak CYP3A4 inhibitors.

• fluconazole

  Monitor Closely (1)fluconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• flurbiprofen

  Monitor Closely (3)telmisartan, flurbiprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  flurbiprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and flurbiprofen both increase serum potassium. Use Caution/Monitor.

• fluvastatin

  Monitor Closely (1)telmisartan increases toxicity of fluvastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• fo-ti

  Minor (1)fo-ti increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• food

  Minor (1)food decreases levels of telmisartan by inhibition of GI absorption. Applies only to oral form of both agents. Minor/Significance Unknown.

• forskolin

  Minor (1)forskolin increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• fosamprenavir

  Monitor Closely (1)fosamprenavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fosaprepitant

  Minor (1)fosaprepitant will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fosinopril

  Serious - Use Alternative (1)telmisartan, fosinopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• fosphenytoin

  Monitor Closely (1)fosphenytoin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fostemsavir

  Monitor Closely (1)fostemsavir will increase the level or effect of telmisartan by Other (see comment). Modify Therapy/Monitor Closely. Fostemsavir inhibits OATP1B1/3 transporter. If possible, avoid coadministration or modify dose of OATP1B1/3 substrates coadministered with fostemsavir.

• furosemide

  Monitor Closely (1)telmisartan increases and furosemide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• gentamicin

  Monitor Closely (1)telmisartan increases and gentamicin decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• glecaprevir/pibrentasvir

  Monitor Closely (2)telmisartan will increase the level or effect of glecaprevir/pibrentasvir by decreasing metabolism. Use Caution/Monitor. Caution when coadministering glecaprevir/pibrentasvir with OATP1B1/OATP1B3 inhibitors
  
  glecaprevir/pibrentasvir will increase the level or effect of telmisartan by Other (see comment). Use Caution/Monitor. Coadministration with glecaprevir/pibrentasvir may increase plasma concentration of drugs that are substrates of OATP1B1 or OATP1B3

• grapefruit

  Minor (1)grapefruit will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• griseofulvin

  Monitor Closely (1)griseofulvin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• heparin

  Monitor Closely (1)heparin increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Low molecular weight heparins may suppress adrenal aldosterone secretion, which can potentially cause hyperkalemia.

• hydrochlorothiazide

  Monitor Closely (1)telmisartan increases and hydrochlorothiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• hydrocortisone

  Minor (1)hydrocortisone will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ibuprofen

  Monitor Closely (3)telmisartan, ibuprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  ibuprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and ibuprofen both increase serum potassium. Use Caution/Monitor.

• ibuprofen IV

  Monitor Closely (3)telmisartan, ibuprofen IV. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  ibuprofen IV decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and ibuprofen IV both increase serum potassium. Use Caution/Monitor.

• idelalisib

  Serious - Use Alternative (1)idelalisib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substrates

• iloperidone

  Monitor Closely (1)iloperidone and amlodipine both increase additive vasodilation. Use Caution/Monitor. Calcium channel blockers with iloperidone may potentiate the hypotensive effects.

• incobotulinumtoxinA

  Minor (1)amlodipine increases effects of incobotulinumtoxinA by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• indapamide

  Monitor Closely (1)telmisartan increases and indapamide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• indomethacin

  Monitor Closely (3)telmisartan, indomethacin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  indomethacin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and indomethacin both increase serum potassium. Use Caution/Monitor.

• insulin aspart

  Monitor Closely (1)telmisartan increases effects of insulin aspart by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin aspart protamine/insulin aspart

  Monitor Closely (1)telmisartan increases effects of insulin aspart protamine/insulin aspart by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin degludec

  Monitor Closely (2)telmisartan increases effects of insulin degludec by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.
  
  telmisartan, insulin degludec. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.

• insulin degludec/insulin aspart

  Monitor Closely (1)telmisartan, insulin degludec/insulin aspart. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.

• insulin detemir

  Monitor Closely (1)telmisartan increases effects of insulin detemir by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin glargine

  Monitor Closely (1)telmisartan increases effects of insulin glargine by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin glulisine

  Monitor Closely (1)telmisartan increases effects of insulin glulisine by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin inhaled

  Monitor Closely (2)telmisartan increases effects of insulin inhaled by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.
  
  telmisartan, insulin inhaled. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.

• insulin isophane human/insulin regular human

  Monitor Closely (1)telmisartan increases effects of insulin isophane human/insulin regular human by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin lispro

  Monitor Closely (1)telmisartan increases effects of insulin lispro by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin lispro protamine/insulin lispro

  Monitor Closely (1)telmisartan increases effects of insulin lispro protamine/insulin lispro by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin NPH

  Monitor Closely (1)telmisartan increases effects of insulin NPH by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• insulin regular human

  Monitor Closely (1)telmisartan increases effects of insulin regular human by unspecified interaction mechanism. Use Caution/Monitor. Concomitant use of insulin and ARBs may require insulin dosage adjustment and increased glucose monitoring.

• irbesartan

  Monitor Closely (1)irbesartan and telmisartan both increase serum potassium. Use Caution/Monitor.

• isavuconazonium sulfate

  Monitor Closely (1)amlodipine will increase the level or effect of isavuconazonium sulfate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• isradipine

  Monitor Closely (1)amlodipine and isradipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• istradefylline

  Monitor Closely (1)istradefylline will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.

• itraconazole

  Monitor Closely (1)itraconazole will increase the level or effect of amlodipine by Other (see comment). Modify Therapy/Monitor Closely. CCBs elicit negative inotropic effects which may be additive to those of itraconazole; additionally, itraconazole can inhibit the metabolism of calcium channel blockers. Monitor for adverse reactions. Concomitant drug dose reduction may be necessary.

• ivosidenib

  Serious - Use Alternative (1)ivosidenib will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternate therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

• ketoconazole

  Monitor Closely (1)ketoconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ketoprofen

  Monitor Closely (3)telmisartan, ketoprofen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  ketoprofen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and ketoprofen both increase serum potassium. Use Caution/Monitor.

• ketorolac

  Monitor Closely (3)telmisartan, ketorolac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  ketorolac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and ketorolac both increase serum potassium. Use Caution/Monitor.

• ketorolac intranasal

  Monitor Closely (3)telmisartan, ketorolac intranasal. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  ketorolac intranasal decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and ketorolac intranasal both increase serum potassium. Use Caution/Monitor.

• labetalol

  Monitor Closely (3)telmisartan and labetalol both increase serum potassium. Use Caution/Monitor.
  
  labetalol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  labetalol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• larotrectinib

  Minor (1)larotrectinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lemborexant

  Monitor Closely (1)amlodipine will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Lower nightly dose of lemborexant recommended if coadministered with weak CYP3A4 inhibitors. See drug monograph for specific dosage modification.

• lenacapavir

  Monitor Closely (1)lenacapavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lencapavir may increase CYP3A4 substrates initiated within 9 months after last SC dose of lenacapavir, which may increase potential risk of adverse reactions of CYP3A4 substrates.

• leniolisib

  Serious - Use Alternative (1)leniolisib will increase the level or effect of telmisartan by Other (see comment). Avoid or Use Alternate Drug. Leniolisib, an OATP1B1 and OATP1B3 inhibitor, may increase systemic exposure of these substrates

• lesinurad

  Monitor Closely (1)lesinurad decreases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• letermovir

  Monitor Closely (3)telmisartan increases levels of letermovir by decreasing metabolism. Use Caution/Monitor. Coadminstration of letermovir, an OATP1B1/3 substrate, with OATP1B1/3 inhibitors may increase letermovir plasma concentrations.
  
  letermovir increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  letermovir increases levels of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Letermovir, an OATP1B1/3 inhibitor may increase plasma concentrations of coadministered OATP1B1/3 substrates.

• levodopa

  Monitor Closely (2)levodopa increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Consider decreasing dosage of antihypertensive agent.
  
  levodopa increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Consider decreasing dosage of antihypertensive agent.

• levoketoconazole

  Monitor Closely (1)levoketoconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• liraglutide

  Monitor Closely (1)telmisartan increases effects of liraglutide by Other (see comment). Use Caution/Monitor. Comment: Angiotensin II receptor antagonists may enhance hypoglycemic effects of antidiabetic agents by improving insulin sensitivity. Monitor patients for changes in glycemic control.

• lisinopril

  Serious - Use Alternative (1)telmisartan, lisinopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• lithium

  Serious - Use Alternative (1)telmisartan increases toxicity of lithium by decreasing renal clearance. Avoid or Use Alternate Drug.Minor (1)amlodipine increases toxicity of lithium by pharmacodynamic synergism. Minor/Significance Unknown. Increased risk of neurotoxicity.

• lofexidine

  Serious - Use Alternative (2)lofexidine, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid coadministration with other drugs that decrease pulse or blood pressure to mitigate risk of excessive bradycardia and hypotension.
  
  lofexidine, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid coadministration with other drugs that decrease pulse or blood pressure to mitigate risk of excessive bradycardia and hypotension.

• lomitapide

  Monitor Closely (1)amlodipine increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lomitapide dose should not exceed 30 mg/day.

• lonafarnib

  Serious - Use Alternative (2)amlodipine will increase the level or effect of lonafarnib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration of lonafarnib (a sensitive CYP3A substrate) with weak CYP3A inhibitors is unavoidable, reduce to, or continue lonafarnib at starting dose. Closely monitor for arrhythmias and events (eg, syncope, heart palpitations) since lonafarnib effect on QT interval is unknown.
  
  lonafarnib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration with sensitive CYP3A substrates. If coadministration unavoidable, monitor for adverse reactions and reduce CYP3A substrate dose in accordance with product labeling.

• lopinavir

  Monitor Closely (1)lopinavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lorlatinib

  Monitor Closely (1)lorlatinib will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lornoxicam

  Monitor Closely (1)telmisartan and lornoxicam both increase serum potassium. Use Caution/Monitor.

• lurasidone

  Monitor Closely (2)lurasidone increases effects of amlodipine by Other (see comment). Use Caution/Monitor. Comment: Potential for increased risk of hypotension with concurrent use. Monitor blood pressure and adjust dose of antihypertensive agent as needed.
  
  lurasidone increases effects of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Potential for increased risk of hypotension with concurrent use. Monitor blood pressure and adjust dose of antihypertensive agent as needed.

• magnesium supplement

  Monitor Closely (1)magnesium supplement, amlodipine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Calcium channel blockers may increase toxic effects of magnesium; magnesium may increase hypotensive effects of calcium channel blockers.

• maitake

  Monitor Closely (1)maitake increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.Minor (1)maitake increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• maraviroc

  Monitor Closely (2)maraviroc, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of orthostatic hypotension.
  
  maraviroc, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of orthostatic hypotension.

• mavacamten

  Monitor Closely (1)telmisartan will increase the level or effect of mavacamten by affecting hepatic enzyme CYP2C19 metabolism. Modify Therapy/Monitor Closely. Inititiation of weak CYP2C19 inhibitors may require decreased mavacamten dose.

• meclofenamate

  Monitor Closely (3)telmisartan, meclofenamate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  meclofenamate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and meclofenamate both increase serum potassium. Use Caution/Monitor.

• mefenamic acid

  Monitor Closely (3)telmisartan, mefenamic acid. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  mefenamic acid decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and mefenamic acid both increase serum potassium. Use Caution/Monitor.

• mefloquine

  Monitor Closely (1)mefloquine increases levels of amlodipine by decreasing metabolism. Use Caution/Monitor. Risk of arrhythmia.

• meloxicam

  Monitor Closely (3)telmisartan, meloxicam. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  meloxicam decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and meloxicam both increase serum potassium. Use Caution/Monitor.

• metformin

  Monitor Closely (1)amlodipine 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.

• methyclothiazide

  Monitor Closely (1)telmisartan increases and methyclothiazide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor. .

• methylphenidate

  Monitor Closely (2)methylphenidate will decrease the level or effect of amlodipine by pharmacodynamic antagonism. Use Caution/Monitor. Methylphenidate may diminish antihypertensive effects. Monitor BP.
  
  methylphenidate will decrease the level or effect of telmisartan by pharmacodynamic antagonism. Use Caution/Monitor. Methylphenidate may diminish antihypertensive effects. Monitor BP.

• methylphenidate transdermal

  Monitor Closely (1)methylphenidate transdermal decreases effects of telmisartan by anti-hypertensive channel blocking. Use Caution/Monitor.

• metipranolol ophthalmic

  Minor (1)metipranolol ophthalmic increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• metolazone

  Monitor Closely (1)telmisartan increases and metolazone decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• metoprolol

  Monitor Closely (2)metoprolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and metoprolol both increase serum potassium. Use Caution/Monitor.

• midazolam intranasal

  Monitor Closely (1)amlodipine will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of mild CYP3A4 inhibitors with midazolam intranasal may cause higher midazolam systemic exposure, which may prolong sedation.

• mifepristone

  Monitor Closely (1)mifepristone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mitotane

  Monitor Closely (1)mitotane decreases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• moexipril

  Serious - Use Alternative (1)telmisartan, moexipril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• moxisylyte

  Monitor Closely (1)moxisylyte and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• mycophenolate

  Monitor Closely (1)telmisartan will decrease the level or effect of mycophenolate by Other (see comment). Use Caution/Monitor. Concommitant administration with telmisartan may result in significant decrease in mycophenolic acid (MPA) concentrations; telmisartan changes MPA?s elimination by enhancing PPAR gamma (peroxisome proliferator-activated receptor gamma) expression, which in turn results in an enhanced UGT1A9 expression and activity

• nabumetone

  Monitor Closely (3)telmisartan, nabumetone. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  nabumetone decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and nabumetone both increase serum potassium. Use Caution/Monitor.

• nadolol

  Monitor Closely (3)nadolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and nadolol both increase serum potassium. Use Caution/Monitor.
  
  nadolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• naproxen

  Monitor Closely (3)telmisartan, naproxen. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  naproxen decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and naproxen both increase serum potassium. Use Caution/Monitor.

• nebivolol

  Monitor Closely (3)nebivolol, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure.
  
  telmisartan and nebivolol both increase serum potassium. Use Caution/Monitor.
  
  nebivolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• nefazodone

  Monitor Closely (1)nefazodone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• nelfinavir

  Minor (1)nelfinavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nevirapine

  Monitor Closely (1)nevirapine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nicardipine

  Monitor Closely (1)amlodipine and nicardipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• nifedipine

  Monitor Closely (1)amlodipine and nifedipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.Serious - Use Alternative (1)nifedipine will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nilotinib

  Monitor Closely (1)nilotinib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nirmatrelvir

  Monitor Closely (1)nirmatrelvir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce amlodipine dose by 50% during coadministration and for 3 more days after the last nirmatrelvir/ritonavir dose.

• nirmatrelvir/ritonavir

  Monitor Closely (1)nirmatrelvir/ritonavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce amlodipine dose by 50% during coadministration and for 3 more days after the last nirmatrelvir/ritonavir dose.

• nisoldipine

  Monitor Closely (1)amlodipine and nisoldipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• nitroglycerin rectal

  Monitor Closely (2)nitroglycerin rectal, telmisartan. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Observe for possible additive hypotensive effects during concomitant use. .
  
  nitroglycerin rectal, amlodipine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Marked orthostatic hypotension has been reported when calcium channel blockers and organic nitrates were used concomitantly. Observe for possible additive hypotensive effects during concomitant use. .

• nitroglycerin sublingual

  Monitor Closely (1)amlodipine, nitroglycerin sublingual. Either increases toxicity of the other by additive vasodilation. Modify Therapy/Monitor Closely. Marked orthostatic hypotension reported with concomitant use.

• nitroprusside sodium

  Monitor Closely (1)amlodipine increases effects of nitroprusside sodium by pharmacodynamic synergism. Use Caution/Monitor.

• noni juice

  Minor (1)telmisartan and noni juice both increase serum potassium. Minor/Significance Unknown.

• octacosanol

  Minor (2)octacosanol increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.
  
  octacosanol increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.

• ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC)

  Monitor Closely (2)ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease dose of calcium channel blocker; dose of amlodipine should be decreased by at least 50%; clinical monitoring of patients is recommended for edema and/or signs and symptoms of hypotension. if such events occur, consider further dose reduction of calcium channel blocker or switching to alternative to calcium channel blocker
  
  ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) will increase the level or effect of amlodipine by altering metabolism. Modify Therapy/Monitor Closely. Decrease dose of calcium channel blocker; dose of amlodipine should be decreased by at least 50%; clinical monitoring of patients is recommended for edema and/or signs and symptoms of hypotension. if such events occur, consider further dose reduction of calcium channel blocker or switching to alternative to calcium channel blocker

• onabotulinumtoxinA

  Minor (1)amlodipine increases effects of onabotulinumtoxinA by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• oxaprozin

  Monitor Closely (3)telmisartan, oxaprozin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  oxaprozin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and oxaprozin both increase serum potassium. Use Caution/Monitor.

• oxcarbazepine

  Minor (1)oxcarbazepine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pancuronium

  Minor (1)amlodipine increases effects of pancuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• parecoxib

  Monitor Closely (1)telmisartan and parecoxib both increase serum potassium. Use Caution/Monitor.

• patiromer

  Monitor Closely (1)patiromer will decrease the level or effect of telmisartan by cation binding in GI tract. Modify Therapy/Monitor Closely. Separate administration by at least 3 hr from patiromer

• penbutolol

  Monitor Closely (3)penbutolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  penbutolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and penbutolol both increase serum potassium. Use Caution/Monitor.

• pentobarbital

  Monitor Closely (1)pentobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• perindopril

  Serious - Use Alternative (1)telmisartan, perindopril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• phenobarbital

  Monitor Closely (1)phenobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• phenoxybenzamine

  Monitor Closely (1)phenoxybenzamine and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• phentolamine

  Monitor Closely (1)phentolamine and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• phenytoin

  Monitor Closely (1)amlodipine will increase the level or effect of phenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• pindolol

  Monitor Closely (3)pindolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  pindolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and pindolol both increase serum potassium. Use Caution/Monitor.

• piroxicam

  Monitor Closely (3)telmisartan, piroxicam. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  piroxicam decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and piroxicam both increase serum potassium. Use Caution/Monitor.

• pitavastatin

  Monitor Closely (1)telmisartan increases toxicity of pitavastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• porfimer

  Minor (1)amlodipine decreases levels of porfimer by unspecified interaction mechanism. Minor/Significance Unknown.

• posaconazole

  Monitor Closely (1)posaconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• potassium acid phosphate

  Monitor Closely (1)telmisartan and potassium acid phosphate both increase serum potassium. Use Caution/Monitor.

• potassium chloride

  Monitor Closely (1)telmisartan and potassium chloride both increase serum potassium. Use Caution/Monitor.

• potassium citrate

  Monitor Closely (1)telmisartan and potassium citrate both increase serum potassium. Use Caution/Monitor.

• potassium citrate/citric acid

  Monitor Closely (1)telmisartan and potassium citrate/citric acid both increase serum potassium. Modify Therapy/Monitor Closely.

• potassium iodide

  Monitor Closely (1)potassium iodide and telmisartan both increase serum potassium. Use Caution/Monitor. Potassium salts may increase the hyperkalemic effects of ARBs; the effect may be the result of aldosterone suppression in patients receiving ARBs.

• potassium phosphates, IV

  Serious - Use Alternative (1)telmisartan and potassium phosphates, IV both increase serum potassium. Avoid or Use Alternate Drug.

• pravastatin

  Monitor Closely (1)telmisartan increases toxicity of pravastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• prazosin

  Monitor Closely (1)prazosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• primidone

  Monitor Closely (1)primidone will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• propranolol

  Monitor Closely (3)telmisartan and propranolol both increase serum potassium. Use Caution/Monitor.
  
  propranolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  propranolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• quinapril

  Serious - Use Alternative (1)telmisartan, quinapril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• quinupristin/dalfopristin

  Minor (1)quinupristin/dalfopristin will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ramipril

  Serious - Use Alternative (2)ramipril, telmisartan. Mechanism: unspecified interaction mechanism. Contraindicated. Increased incidence of clinically important renal dysfunction (death, doubling of serum creatinine, dialysis) compared with groups receiving either drug alone. .
  
  telmisartan, ramipril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• rapacuronium

  Minor (1)amlodipine increases effects of rapacuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• reishi

  Minor (2)reishi increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.
  
  reishi increases effects of telmisartan by pharmacodynamic synergism. Minor/Significance Unknown.

• revefenacin

  Serious - Use Alternative (1)telmisartan increases levels of revefenacin by Other (see comment). Avoid or Use Alternate Drug. Comment: OATP1B1 and OATP1B3 transport inhibitors may increase systemic exposure of revefenacin's active metabolite. Coadministration not recommended.

• ribociclib

  Monitor Closely (1)ribociclib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifabutin

  Monitor Closely (1)rifabutin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifampin

  Monitor Closely (1)rifampin will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifapentine

  Monitor Closely (1)rifapentine will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ritonavir

  Monitor Closely (1)ritonavir will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rocuronium

  Minor (1)amlodipine increases effects of rocuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• rucaparib

  Monitor Closely (1)rucaparib will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• rufinamide

  Minor (1)rufinamide will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib

  Minor (1)amlodipine will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib topical

  Minor (1)amlodipine will increase the level or effect of ruxolitinib topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sacubitril/valsartan

  Monitor Closely (1)telmisartan and sacubitril/valsartan both increase serum potassium. Use Caution/Monitor.

• salicylates (non-asa)

  Monitor Closely (1)telmisartan and salicylates (non-asa) both increase serum potassium. Use Caution/Monitor.

• salsalate

  Monitor Closely (3)telmisartan, salsalate. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  salsalate decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and salsalate both increase serum potassium. Use Caution/Monitor.

• saquinavir

  Monitor Closely (1)saquinavir increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Potential for increased toxicity. .

• secobarbital

  Minor (1)secobarbital will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• shepherd's purse

  Minor (2)shepherd's purse, telmisartan. Other (see comment). Minor/Significance Unknown. Comment: Theoretically, shepherd's purse may interfere with BP control.
  
  shepherd's purse, amlodipine. Other (see comment). Minor/Significance Unknown. Comment: Theoretically, shepherd's purse may interfere with BP control.

• silodosin

  Monitor Closely (1)silodosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• simvastatin

  Minor (1)telmisartan increases toxicity of simvastatin by Other (see comment). Minor/Significance Unknown. Comment: OATP1B1 inhibitors may increase risk of myopathy.Serious - Use Alternative (1)amlodipine increases levels of simvastatin by Other (see comment). Avoid or Use Alternate Drug. Comment: Benefits of combination therapy should be carefully weighed against the potential risks of combination. Potential for increased risk of myopathy/rhabdomyolysis. Limit simvastatin dose to no more than 20 mg/day when used concurrently.

• sodium sulfate/?magnesium sulfate/potassium chloride

  Monitor Closely (2)amlodipine, sodium sulfate/?magnesium sulfate/potassium chloride. Either increases effects of the other by unknown mechanism. Use Caution/Monitor. Monitor for hypotension or muscle weakness in patients receiving calcium channel blockers with elevated serum magnesium concentrations.
  
  sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.

• sodium sulfate/potassium sulfate/magnesium sulfate

  Monitor Closely (2)sodium sulfate/potassium sulfate/magnesium sulfate increases toxicity of telmisartan by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.
  
  amlodipine, sodium sulfate/potassium sulfate/magnesium sulfate. Either increases effects of the other by unknown mechanism. Use Caution/Monitor. Monitor for hypotension or muscle weakness in patients receiving calcium channel blockers with elevated serum magnesium concentrations.

• sotalol

  Monitor Closely (3)telmisartan and sotalol both increase serum potassium. Use Caution/Monitor.
  
  sotalol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.
  
  sotalol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.

• sparsentan

  Contraindicated (1)sparsentan, telmisartan. Either increases toxicity of the other by pharmacodynamic synergism. Contraindicated. Coadministration of ARBs with sparsentan is associated with increased risks of hypotension, syncope, hyperkalemia, and changes in renal function (eg, acute renal failure).

• spironolactone

  Monitor Closely (1)telmisartan and spironolactone both increase serum potassium. Modify Therapy/Monitor Closely.

• St John's Wort

  Monitor Closely (1)St John's Wort will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• stiripentol

  Monitor Closely (1)stiripentol, amlodipine. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.

• succinylcholine

  Minor (1)amlodipine increases effects of succinylcholine by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• sulbactam/durlobactam

  Serious - Use Alternative (1)telmisartan will increase the level or effect of sulbactam/durlobactam by Other (see comment). Avoid or Use Alternate Drug. Sulbactam is predicted to have active secretion by OATP1 as a significant portion of total clearance; therefore, inhibition of OAT1 may increase sulbactam plasma concentrations

• sulfasalazine

  Monitor Closely (3)telmisartan, sulfasalazine. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  sulfasalazine decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and sulfasalazine both increase serum potassium. Use Caution/Monitor.

• sulindac

  Monitor Closely (3)telmisartan, sulindac. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  sulindac decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and sulindac both increase serum potassium. Use Caution/Monitor.

• synthetic human angiotensin II

  Monitor Closely (1)telmisartan decreases effects of synthetic human angiotensin II by pharmacodynamic antagonism. Use Caution/Monitor.

• tacrolimus

  Monitor Closely (1)amlodipine will increase the level or effect of tacrolimus by unspecified interaction mechanism. Modify Therapy/Monitor Closely. Adjust dose when appropriate.

• tadalafil

  Monitor Closely (2)tadalafil increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.
  
  tadalafil increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

• tazemetostat

  Monitor Closely (2)tazemetostat will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  amlodipine will decrease the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tecovirimat

  Monitor Closely (1)tecovirimat will decrease the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• temsirolimus

  Monitor Closely (1)amlodipine increases toxicity of temsirolimus by Other (see comment). Use Caution/Monitor. Comment: Combination of mTOR inhibitors with calcium channel blockers increases risk of angioedema.

• terazosin

  Monitor Closely (1)terazosin and amlodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• terbutaline

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

• timolol

  Monitor Closely (3)timolol, telmisartan. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of fetal compromise if given during pregnancy.
  
  telmisartan and timolol both increase serum potassium. Use Caution/Monitor.
  
  timolol and amlodipine both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

• tinidazole

  Monitor Closely (1)amlodipine will increase the level or effect of tinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tipranavir

  Monitor Closely (1)tipranavir increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Potential for increased toxicity. Tipranavir is used with ritonavir (boosted therapy) which is a potent CYP3A4 inhibitor.

• tizanidine

  Monitor Closely (1)tizanidine increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.Minor (1)tizanidine increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypotension.

• tolfenamic acid

  Monitor Closely (1)telmisartan and tolfenamic acid both increase serum potassium. Use Caution/Monitor.

• tolmetin

  Monitor Closely (3)telmisartan, tolmetin. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May result in renal function deterioration, particularly in elderly or volume depleted individuals.
  
  tolmetin decreases effects of telmisartan by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. NSAIDs decrease synthesis of vasodilating renal prostaglandins, and thus affect fluid homeostasis and may diminish antihypertensive effect.
  
  telmisartan and tolmetin both increase serum potassium. Use Caution/Monitor.

• tolvaptan

  Monitor Closely (1)telmisartan and tolvaptan both increase serum potassium. Use Caution/Monitor.

• torsemide

  Monitor Closely (1)telmisartan increases and torsemide decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.

• trandolapril

  Serious - Use Alternative (1)telmisartan, trandolapril. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Dual blockade of renin-angiotensin system increases risks of hypotension, hyperkalemia, and renal impairment.

• treprostinil

  Monitor Closely (1)treprostinil increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.Minor (1)treprostinil increases effects of amlodipine by pharmacodynamic synergism. Minor/Significance Unknown.

• triamterene

  Monitor Closely (1)telmisartan and triamterene both increase serum potassium. Modify Therapy/Monitor Closely.

• trimagnesium citrate anhydrous

  Monitor Closely (1)trimagnesium citrate anhydrous, amlodipine. Either increases effects of the other by Other (see comment). Use Caution/Monitor. Comment: Possible additive effect of magnesium and calcium channel blockers on reduction of ionic calcium may increase risk of hypotension or muscle weakness.

• trimethoprim

  Monitor Closely (1)trimethoprim and telmisartan both increase serum potassium. Use Caution/Monitor. Trimethoprim decreases urinary potassium excretion. May cause hyperkalemia, particularly with high doses, renal insufficiency, or when combined with other drugs that cause hyperkalemia.

• trofinetide

  Serious - Use Alternative (1)trofinetide will increase the level or effect of telmisartan by Other (see comment). Avoid or Use Alternate Drug. Trofinetide (an OATP131 and OATP13B inhibitor) may increase plasma levels of OATP131 or OATP13B substrates. Avoid coadministration with sensitive substrates.

• vecuronium

  Minor (1)amlodipine increases effects of vecuronium by pharmacodynamic synergism. Minor/Significance Unknown. Ca Channel Blockers interfere w/Ach release from prejunctional axon.

• verapamil

  Monitor Closely (1)amlodipine and verapamil both increase anti-hypertensive channel blocking. Use Caution/Monitor.

• verteporfin

  Minor (1)amlodipine increases levels of verteporfin by pharmacodynamic synergism. Minor/Significance Unknown.

• voclosporin

  Monitor Closely (2)voclosporin and telmisartan both increase serum potassium. Use Caution/Monitor.
  
  voclosporin, telmisartan. Either increases toxicity of the other by nephrotoxicity and/or ototoxicity. Modify Therapy/Monitor Closely. Coadministration with drugs associated with nephrotoxicity may increase the risk for acute and/or chronic nephrotoxicity.

• voriconazole

  Monitor Closely (2)voriconazole will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  voriconazole increases levels of amlodipine by decreasing metabolism. Use Caution/Monitor.

• voxelotor

  Serious - Use Alternative (1)voxelotor will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

• xipamide

  Monitor Closely (2)xipamide increases effects of amlodipine by pharmacodynamic synergism. Use Caution/Monitor.
  
  xipamide increases effects of telmisartan by pharmacodynamic synergism. Use Caution/Monitor.