She obtained her Master of Science in nursing with a focus in education from the University of Phoenix. Nevins shares her passion for healthy living through her roles as educator, nursing consultant and writer. Propranolol hydrochloride is a medication used to treat high blood pressure, irregular heart rhythms (arrhythmia), myocardial infarction (heart attack), and it is also used to prevent migraines. Propranolol slows down a person's heart rate and makes it easier for the heart to beat. This action gives propranolol its antihypertensive (blood pressure lowering) effects. Higher doses of propranolol work to control heart arhrythmias. Side effects of this medication can affect a variety of body functions.