Teva Atenolol 100mg X 28 Tab is a prescription medication used to treat high blood pressure and chest pain (angina). It belongs to a class of drugs called beta blockers, which work by blocking certain natural substances in the body to reduce blood pressure and the workload on the heart. This medication is also used to prevent future heart attacks and strokes.Teva Atenolol 100mg X 28 Tab comes in a tablet form and is taken orally, usually once a day. It should be taken with food or milk to reduce stomach upset. Common side effects of this medication include dizziness, tiredness, and cold hands and feet. It is important to take this medication exactly as prescribed by your doctor. Do not stop taking this medication without talking to your doctor first.