You should not receive this medicine if you have had an allergic reaction to atenolol, if you are pregnant, or if you have certain heart problems. Talk with your doctor about what these heart problems are.
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 reserpine, blood pressure medicines (such as clonidine, Catapres®, diltiazem, verapamil, Adalat®, Calan®, Cardizem®, Lotrel®), or any pain or arthritis medicines, also called "NSAIDs" (such as flurbiprofen, ibuprofen, indomethacin, naproxen, piroxicam, Advil®, Ansaid®, Feldene®, Indocin®, Naprosyn®).
Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant. If you think you have become pregnant while using the medicine, tell your doctor right away.
Make sure your doctor knows if you are breastfeeding, or if you have asthma, bronchitis, emphysema, diabetes, kidney disease, or an overactive thyroid. Make sure you tell your doctor if you have an adrenal gland tumor (pheochromocytoma).