Many drugs can interact with verapamil. Some drugs can raise or lower your blood levels of verapamil, which may cause side effects or make it less effective. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any you start or stop using, especially:
aspirin, imatinib, lithium, nefazodone, St. John's wort;
all other heart or blood pressure medicines, especially clonidine, digoxin, flecainide, ivabradine, nicardipine, or quinidine;
an antibiotic - clarithromycin, telithromycin;
antifungal medicine - itraconazole, ketoconazole, posaconazole, voriconazole;
antiviral medicine to treat hepatitis or HIV/AIDS - atazanavir, boceprevir, cobicistat, delavirdine, efavirenz, fosamprenavir, indinavir, nelfinavir, ritonavir, saquinavir;
a beta blocker - atenolol, carvedilol, labetalol, metoprolol, nadolol, nebivolol, propranolol, sotalol, and others;
cholesterol lowering medicine - atorvastatin, fluvastatin, lovastatin, pitavastatin, pravastatin, rosuvastatin, simvastatin;
drugs to treat high blood pressure or a prostate disorder - alfuzosin, doxazosin, prazosin, terazosin, silodosin, tamsulosin;
seizure medicine - carbamazepine, phenobarbital, phenytoin; or
tuberculosis medicine - isoniazid, rifampin.
This list is not complete and many other drugs can interact with verapamil. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.
 Verapamil drug interactions (more detail)
