Atenolol is the generic form of the brand-name medication Tenormin. It is used to treat high blood pressure and chest pain following a heart attack by relaxing blood vessels and improving blood flow.

Typically, you take it once to twice daily, with or without food. Common side effects include fatigue, dizziness, lightheadedness, shortness of breath, and nausea. Patients with diabetes or asthma should avoid atenolol. Do not stop taking atenolol suddenly, as this can cause chest pain, a heart attack, or an irregular heartbeat. Lastly, inform your doctor of all other medications (including over-the-counter drugs and supplements) you are taking in order to prevent drug interactions.This paragraph is only an overview, and it is not intended to replace medical counseling; please consult your pharmacist and/or medical provider for more comprehensive information.