Penbutolol is a beta blocker that is primarily used to treat high blood pressure, angina, and irregular heartbeat. It can also be used to prevent heart attacks and improve exercise tolerance in patients suffering from heart disease. The drug works by blocking the effects of adrenaline, which in turn lowers the heart rate and reduces the workload of the heart. Some of the common synonyms for penbutolol include Levatol, Betapressin, Betapressin H, and Levatol H. These medications contain the same active ingredient as penbutolol and are used for similar medical conditions. It is important to consult with a medical professional before starting any new medications.