Inderal 40mg tablets contain propranolol, a beta-blocker medication used to treat various cardiovascular conditions including high blood pressure, angina, and irregular heartbeat. Each pack contains 50 tablets manufactured by AstraZeneca. Propranolol works by blocking the action of certain natural chemicals in your body, such as epinephrine, on the heart and blood vessels. This effect reduces heart rate, blood pressure, and strain on the heart. The medication requires a prescription and should only be taken under medical supervision. Common side effects may include tiredness, sleep problems, and cold hands/feet. The tablets should be stored at room temperature away from moisture and heat.