Learn about the side effects of propranolol, from common to rare, for consumers and healthcare professionals. Propranolol is a beta-blocker used to treat high blood pressure, irregular heartbeats, shaking (tremors), and other conditions. It is used after a heart attack to improve the chance of survival. It is also used to prevent migraine headaches and chest pain (angina). Propranolol is being investigated as a potential treatment for PTSD. [33][34][35] Propranolol works to inhibit the actions of norepinephrine (noradrenaline), a neurotransmitter that enhances memory consolidation. [citation needed] Propranolol is used alone or together with other medicines to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly. Overview: Propranolol is used for high blood pressure, chest pain, heart problems, and migraine prevention, among other uses. It works by slowing your heart rate and reducing how hard your heart. Propranolol is a prescription nonselective beta-blocker used to treat high blood pressure (hypertension), angina (chest pain), irregular heart rhythms, tremors, and to reduce the risk of complications after a heart attack. Find out how propranolol treats heart problems and helps with symptoms of anxiety and migraines, and how to take it. NHS medicines information on propranolol – what it's used for, side effects, dosage and who can take it.