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Calan (verapamil) Disease Interactions

There are 12 disease interactions with Calan (verapamil):

Ccbs (Includes Calan) ↔ Aortic Stenosis

Severe Potential Hazard, High plausibility

Applies to: Aortic Stenosis

The use of some calcium channel blockers (CCBs) is contraindicated in patients with advanced aortic stenosis. CCBs whose pharmacologic effect is partially dependent on their ability to reduce afterload (e.g., diltiazem, nicardipine, nifedipine, verapamil) may be of less benefit in these patients due to a fixed impedance to flow across the aortic valve and may, in fact, worsen rather than improve myocardial oxygen balance. Rarely, heart failure has developed following the initiation of these CCBs, particularly in patients receiving concomitant beta-blocker therapy.


  1. "Product Information. Adalat (nifedipine)." Bayer, West Haven, CT.
  2. "Product Information. Cardene (nicardipine)." Syntex Laboratories Inc, Palo Alto, CA.
  3. "Product Information. Procardia (nifedipine)." Pfizer US Pharmaceuticals, New York, NY.

Ccbs (Includes Calan) ↔ Bradyarrhythmia/Av Block

Severe Potential Hazard, High plausibility

Applies to: Heart Block, Sinus Node Dysfunction

The use of some calcium channel blockers (CCBs) is contraindicated in patients with severe bradyarrhythmia, sick sinus syndrome (unless a functioning pacemaker is present), or heart block greater than the first degree (unless a functioning pacemaker is present). CCBs like bepridil, diltiazem and verapamil have a negative effect on AV conduction and the SA node and may exacerbate these conditions.


  1. Colombo G, Zucchella G, Planca E, Grieco A "Intravenous diltiazem in the treatment of unstable angina: a study of efficacy and tolerance." Clin Ther 9 (1987): 536-47
  2. Aromatorio GJ, Uretsky BF, Reddy PS "Hypotension and sinus arrest with nifedipine in pulmonary hypertension." Chest 87 (1985): 265-7
  3. Gobel EJAM, Hautvast RWM, Vangilst WH, Spanjaard JN, Hillege HL, Dejongste MJL, Molhoek GP, Lie KI "Randomised, double-blind trial of intravenous diltiazem versus glyceryl trinitrate for unstable angina pectoris." Lancet 346 (1995): 1653-7
View all 14 references

Ccbs (Includes Calan) ↔ Cardiogenic Shock/Hypotension

Severe Potential Hazard, High plausibility

Applies to: Cardiogenic Shock, Hypotension

In general, calcium channel blockers (CCBs) should not be used in patients with hypotension (systolic pressure < 90 mm Hg) or cardiogenic shock. Due to potential negative inotropic and peripheral vasodilating effects, the use of CCBs may further depress cardiac output and blood pressure, which can be detrimental in these patients. The use of verapamil and diltiazem is specifically contraindicated under these circumstances.


  1. "Product Information. Calan (verapamil)." Searle, Skokie, IL.
  2. Stehle G, Buss J, Eibach J, et al "Cardiogenic shock associated with verapamil in a patient with liver cirrhosis." Lancet 336 (1990): 1079
  3. "Product Information. Vascor (bepridil)." McNeil Pharmaceutical, Raritan, NJ.
View all 6 references

Ccbs (Includes Calan) ↔ Coronary Artery Disease

Severe Potential Hazard, Low plausibility

Applies to: Ischemic Heart Disease

Increased frequency, duration, and/or severity of angina, as well as acute myocardial infarction, have rarely developed during initiation or dosage increase of calcium channel blockers (CCBs), particularly in patients with severe obstructive coronary artery disease and those treated with immediate-release formulations. The mechanism of this effect is not established. Therapy with CCBs should be administered cautiously in patients with significant coronary artery disease.


  1. Kloner RA "Nifedipine in ischemic heart disease." Circulation 92 (1995): 1074-8
  2. Myrhed M, Wiholm B-E "Nifedipine: a survey of adverse effects." Acta Pharmacol Toxicol (Copenh) 58 (1986): 133-6
  3. Thomassen AR, Bagger JP, Nielsen TT "Hemodynamic and cardiac metabolic changes during nicardipine-induced myocardial ischemia." Cathet Cardiovasc Diagn 14 (1988): 41-3
View all 15 references

Ccbs (Includes Calan) ↔ Liver Disease

Severe Potential Hazard, High plausibility

Applies to: Liver Disease

Calcium channel blockers (CCBs) are extensively metabolized by the liver. The half-lives of CCBs may be prolonged substantially in patients with severe hepatic impairment, with the potential for significant drug accumulation. In addition, the use of some CCBs has been associated with elevations in serum transaminases, both with and without concomitant elevations in alkaline phosphatase and bilirubin. While these effects may be transient and reversible, several patients have developed cholestasis or hepatocellular injury that was proven by rechallenge. Therapy with CCBs should be administered cautiously and often at reduced dosages in patients with significantly impaired hepatic function. Periodic monitoring of liver function and for excessive pharmacologic effects (e.g., abnormal prolongation of PR interval) is advised, and the dosage adjusted if necessary.


  1. Stern EH, Pitchon R, King BD, Wiener I "Possible hepatitis from verapamil." N Engl J Med 306 (1982): 612-3
  2. Giacomini KM, Massoud N, Wong FM, Giacomini JC "Decreased binding of verapamil to plasma proteins in patients with liver disease." J Cardiovasc Pharmacol 6 (1984): 924-8
  3. "Product Information. Calan (verapamil)." Searle, Skokie, IL.
View all 53 references

Diltiazem/Verapamil Iv (Includes Calan) ↔ Ventricular Tachycardia

Severe Potential Hazard, High plausibility

Applies to: Ventricular Arrhythmia

The use of intravenous diltiazem or verapamil is contraindicated in patients with ventricular tachycardia. IV administration of a calcium channel blocker can precipitate cardiac arrest in such patients. Marked hemodynamic deterioration and ventricular fibrillation have occurred in patients with wide-complex ventricular tachycardia (QRS >= 0.12 seconds) treated with IV verapamil.


  1. "Product Information. Calan (verapamil)." Searle, Skokie, IL.
  2. Winters SL, Schweitzer P, Kupersmith J, Gomes JA "Verapamil-induced polymorphous ventricular tachycardia." J Am Coll Cardiol 6 (1985): 257-9
  3. Buxton AE, Marchlinski FE, Doherty JU, et al "Hazards of intravenous verapamil for sustained ventricular tachycardia." Am J Cardiol 59 (1987): 1107-10
View all 4 references

Verapamil (Includes Calan) ↔ Accessory Av Tracts

Severe Potential Hazard, High plausibility

Applies to: Preexcitation Syndrome

The use of verapamil is contraindicated for the management of atrial flutter or fibrillation in patients with an accessory AV tract (e.g., those with Wolff-Parkinson-White or Lown-Ganong-Levine syndrome). Intravenous verapamil has been reported to cause ventricular fibrillation and cardiac arrest in such patients, the mechanism of which is related to the drug's ability to shorten the refractory period and accelerate antegrade conduction within the accessory pathway. Although these events have not been associated with chronic use of oral verapamil, a similar risk may exist.


  1. Fauci AS, Braunwald E, Isselbacher KJ, Wilson JD, Martin JB, Kasper DL, Hauser SL, Longo DL, eds. "Harrison's Principles of Internal Medicine. 14th ed." New York, NY: McGraw-Hill Health Professionals Division (1998):
  2. Jacob AS, Nielsen DH, Gianelly RE "Fatal ventricular fibrillation following verapamil in Wolff-Parkinson-White syndrome with atrial fibrillation." Ann Emerg Med 14 (1985): 159-60
  3. Hame A, Peter T, Platt M, Mandel WJ "Effects of verapamil on supraventricular tachycardia in patients with overt and concealed wolff-parkinson-white syndrome." Am Heart J 101 (1981): 600-12
View all 8 references

Verapamil (Includes Calan) ↔ Chf/Ami

Severe Potential Hazard, High plausibility

Applies to: Congestive Heart Failure, Myocardial Infarction

The use of verapamil is contraindicated in patients with severe left ventricular dysfunction (e.g., ejection fraction < 30%) or moderate to severe symptoms of cardiac failure and in patients with any degree of ventricular dysfunction if they are receiving a beta-adrenergic blocker. Likewise, verapamil should not be given to patients with acute myocardial infarction and pulmonary congestion documented by X-ray on admission, since associated heart failure may be acutely worsened. Verapamil has a negative inotropic effect, which in most patients is compensated by a simultaneous reduction in afterload (i.e. decreased systemic vascular resistance) without a net impairment of ventricular performance. However, congestive heart failure or pulmonary edema have developed in approximately 2% of patients treated with verapamil. Mild symptoms of cardiac failure should be under control, if possible, prior to initiating verapamil therapy.


  1. Shimoni A, Maorkendler Y, Neuman Y "Verapamil-induced acute right heart failure." Am Heart J 132 (1996): 193-4
  2. Baky SH, Singh BN "Verapamil hydrochloride: pharmacological properties and role in cardiovascular therapeutics." Pharmacotherapy 2 (1982): 328-50
  3. Pollak A, Falk RH "Left ventricular systolic dysfunction precipitated by verapamil in cardiac amyloidosis." Chest 104 (1993): 618-20
View all 4 references

Verapamil (Includes Calan) ↔ Hypertrophic Cardiomyopathy

Severe Potential Hazard, Moderate plausibility

Applies to: Hypertrophic Cardiomyopathy

The use of verapamil in patients with hypertrophic cardiomyopathy, or idiopathic hypertrophic subaortic stenosis, has been associated with serious side effects such as pulmonary edema, severe hypotension, sinus bradycardia, AV block, sinus arrest, and death. However, a causal relationship has not been established. Therapy with verapamil should be administered cautiously in patients with hypertrophic cardiomyopathy. Dosage reduction or drug discontinuation may be required if severe adverse effects occur.


  1. "Product Information. Calan (verapamil)." Searle, Skokie, IL.

Verapamil (Includes Calan) ↔ Neuromuscular Transmission

Moderate Potential Hazard, Moderate plausibility

Applies to: Myopathy, Myoneural Disorder

Verapamil has been reported to decrease neuromuscular transmission in patients with Duchenne's muscular dystrophy and to prolong recovery from the neuromuscular blocking agent, vecuronium. Therapy with verapamil should be administered cautiously in patients with attenuated neuromuscular transmission or myopathy, since these conditions may be exacerbated. A reduced dosage may be appropriate.


  1. "Product Information. Calan (verapamil)." Searle, Skokie, IL.
  2. Reverte M "Adverse effect of verapamil in myasthenia gravis: an additional comment." Muscle Nerve 16 (1993): 879-81
  3. "Product Information. Isoptin (verapamil)." Knoll Pharmaceutical Company, Whippany, NJ.

Verapamil (Includes Calan) ↔ Renal Dysfunction

Moderate Potential Hazard, High plausibility

Applies to: Renal Dysfunction

Approximately 70% of an administered dose of verapamil is excreted as metabolites in the urine. The primary metabolite, norverapamil, has about 20% the cardiovascular activity and can reach steady-state plasma concentrations approaching those of the parent drug. Patients with impaired renal function may be at greater risk for adverse effects due to drug and metabolite accumulation. Therapy with verapamil should be administered cautiously in such patients, with appropriate monitoring for excessive pharmacologic effects (e.g., abnormal prolongation of PR interval) and the dosage adjusted accordingly as necessary.


  1. Kates RE "Calcium antagonists: pharmacokinetic properties." Drugs 25 (1983): 113-24
  2. McAllister RG Jr, Hamann SR, Blouin RA "Pharmacokinetics of calcium-entry blockers." Am J Cardiol 55 (1985): b30-40
  3. "Product Information. Calan (verapamil)." Searle, Skokie, IL.
View all 9 references

Verapamil Hs (Includes Calan) ↔ Gi Narrowing

Moderate Potential Hazard, Moderate plausibility

Applies to: Gastrointestinal Obstruction

The controlled-onset, extended-release formulation of verapamil (Covera-HS) contains a non-deformable material. There have been rare reports of obstructive symptoms in patients with known strictures following the ingestion of similar sustained-release products. Therapy with the controlled-onset, extended-release formulation of verapamil should be administered cautiously in patients with preexisting severe gastrointestinal narrowing or obstruction, whether pathologic or iatrogenic.


  1. "Product Information. Covera-HS (verapamil)." Searle, Skokie, IL.

You should also know about...

Calan (verapamil) drug Interactions

There are 673 drug interactions with Calan (verapamil)

Calan (verapamil) alcohol/food Interactions

There are 3 alcohol/food interactions with Calan (verapamil)

Drug Interaction Classification

The classifications below are a general guideline only. It is difficult to determine the relevance of a particular drug interaction to any individual given the large number of variables.

Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.

Do not stop taking any medications without consulting your healthcare provider.

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