Atenolol (Tenormin) is a beta blocker used to treat high blood pressure and angina pectoris (chest pain). Atenolol (Tenormin) is also used after a heart attack.
Atenolol side effects, that may go away during treatment, include Atenolol side effects like mild drowsiness; lightheadedness or dizziness; or unusual tiredness or weakness. If Atenolol side effects continue or are bothersome, check with your doctor. CHECK WITH YOUR DOCTOR AS SOON AS POSSIBLE if you experience Atenolol side effects like difficulty in breathing. If you notice other Atenolol side effects not listed above, contact your doctor, nurse, or pharmacist.