Propranolol is a prescribed beta blocker that boosts blood flow and reduces blood pressure. It is therefore commonly used for the treatment of high blood pressure, breast pain, as well as to enhance survival after a cardiac arrest. Notify your doctor of other medicines you are taking right now, including yet not limited to hypertension medications, medications for the therapy of colds, supplements, medicines for migraine headaches, asthma or allergic reactions medications, discomfort medicines, reserpine, and medicines for cardiovascular disease. Expect any type of negative side effects that appear major to you. For example, if you experience lightheadedness, diarrhea, throwing up, rash, upset belly, too much tiredness, irregularity, dizziness, or sleeplessness - there is no need to get uneasy, as these are the moderate effects likely to fade away by themselves as your body adjusts to the dosage and routine of taking propranolol. You could proceed taking propranolol if you see these light negative effects: constipation, excessive fatigue, sleep loss, breakout, looseness of the bowels, lightheadedness, upset tummy, throwing up, and lightheadedness.