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What should I know about Calan (verapamil) before taking it?

If you are allergic to any of the active ingredients found in Calan (verapamil), you should not take this medication.

Be aware that certain medical conditions can put you at risk for complications associated with the use of Calan. These medical conditions include heart problems like left ventricular dysfunction, sick sinus syndrome, or heart block, low blood pressure, heart failure, pregnancy, lung congestion, nursing, recent heart attack, muscular dystrophy, kidney or liver problems, congestive heart failure, a neuromuscular disease, atrial fibrillation or flutter, a pre-excitation syndrome, or shock because of severe heart issues. Medications that may affect your dosage of Calan include digoxin, HMG-CoA reductase inhibitors, cyclosporine, phenobarbital, doxorubicin, dofetillide, eletriptan, ritonavir, dronedarone, everolimus, erythromycin, narcotic pain relievers, lithium, quinazolines, paclitaxel, ranolazine, quinidine, theophylines, disopyramide, dofetillide, blood pressure medications, flecainide, cancer treatments, beta-blockers, ketolides, clonidine, macrolides, colchicines, rifampin, St. John's wort, aldosterone blockers, carbamazepine, aspirin, and tolvaptan. Additionally, you should not drink alcohol while taking this medication. You should also avoid situations that may cause fainting, such as hot weather, exhausting exercise, and fever.

As this is not an exhaustive list of possible interactions, you should discuss your medications with your doctor in order to predict all of the possible drug interactions.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.