You should not receive this medicine if you have had an allergic reaction to verapamil. You should not receive this medicine if you have severe low blood pressure, heart disease such as congestive heart failure, shock, or certain heart problems. You should not receive this medicine if you are receiving beta blockers given through a needle placed in one of your veins.
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
Make sure your doctor knows if you are using digitalis (Lanoxin®, Digitek®), disopyramide (Norpace®), flecainide (Tambocor®), or quinidine (Quinidex®). Tell your doctor if you are also using a beta blocker such as atenolol, metoprolol, propranolol, or Toprol® by mouth.
Make sure your doctor knows if you are also using seizure medicine such as carbamazepine (Tegretol®). Tell your doctor if you are also using dantrolene (Dantrium®), lithium, rifampin (Rifadin®), phenobarbital, or cyclosporine (Sandimmune®, Neoral®).
Make sure your doctor knows if you are pregnant or breastfeeding. Your doctor may have you stop breastfeeding your baby while you are receiving this medicine. Talk to your doctor about the length of time you need to formula feed your baby.
Make sure your doctor knows if you have low blood pressure, brain tumor, heart disease, liver disease, kidney disease, or Duchenne's muscular dystrophy.