Before taking verapamil,
tell your doctor and pharmacist if you are allergic to verapamil, any other medications, or any ingredients in verapamil. Ask your pharmacist for a list of the ingredients.
tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, and nutritional supplements you are taking or plan to take. Be sure to mention any of the following: alpha blockers such as prazosin (Minipress); antifungals such as itraconazole (Onmel, Sporanox) and ketoconazole (Nizoral); aspirin; beta blockers such as atenolol (Tenormin, in Tenoretic), metoprolol (Lopressor, Toprol XL, in Dutoprol), nadolol (Corgard, in Corzide), propranolol (Inderal, Innopran, in Inderide), and timolol (Blocadren, in Timolide); carbamazepine (Carbatrol, Epitol, Equetro, Tegretol); cimetidine (Tagamet); clarithromycin (Biaxin, in Prevpac); cyclosporine (Neoral, Sandimmune); digoxin (Lanoxin); disopyramide (Norpace); diuretics (''water pills''); erythromycin (E.E.S., Eryc, Erythrocin); flecainide; certain HIV protease inhibitors such as indinavir (Crixivan), nelfinavir (Viracept), and ritonavir (Norvir, in Kaletra); quinidine (in Nuedexta); lithium (Lithobid); medications to treat high blood pressure; nefazodone; phenobarbital; pioglitazone (Actos, in Duetact, in Oseni); rifampin (Rifadin, Rimactane); telithromycin (Ketek); and theophylline (Theochron, Theolair, Uniphyl). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with verapamil, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
tell your doctor what herbal products you are taking, especially St. John's wort.
tell your doctor if you have or have ever had narrowing or blockage of your digestive system or any other condition that causes food to move through your digestive system more slowly; heart failure; heart, liver, or kidney disease; muscular dystrophy (inherited disease that causes gradual weakening of muscles); or myasthenia gravis (condition that causes certain muscles to weaken).
tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking verapamil, call your doctor.
if you are having surgery, including dental surgery, tell your doctor or dentist that you are taking verapamil.
talk to your doctor about the safe use of alcoholic beverages during your treatment with verapamil. Verapamil may cause the effects of alcohol to be more severe and longer-lasting.