Tenormin Generic name : atenolol (a TEN oh lol) Brand name : Tenormin Drug class : Cardioselective beta blockers Medically reviewed by Drugs.com. Last updated on Aug 30, 2021 What is Tenormin? Tenormin (atenolol) is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Tenormin is used to treat angina (chest pain) and hypertension (high blood pressure). Tenormin is also used to lower the risk of death after a heart attack. Warnings You should not use this Tenormin if you have a serious heart condition such as "AV block," very slow heartbeats, or heart failure. Do not stop taking Tenormin without first talking to your doctor. Stopping suddenly may make your condition worse. If you need to have any type of surgery, you may need to temporarily stop using Tenormin. Be sure the surgeon knows ahead of time that you are using this medicine. Dosing information Usual Adult Dose of Tenormin for Hypertension: Initial dose : 50 mg orally once a ...