Propranolol is a prescription beta blocker usually recommended for patients diagnosed with high blood pressure, abnormal heart rhythms or heart disease. The effects of propranolol are based on relaxing the blood vessels and lowering the blood pressure, which is why it can be also used by those willing to avoid angina (chest pain) and migraine headaches. Propranolol also helps to improve survival rates after a heart attack. To make sure you benefit the most from taking propranolol make sure you talk to your health care provider about any medicines you are taking at the moment. These may be the following ones: asthma or allergies meds, drugs for migraine headaches, vitamins, high blood pressure medicines, medicines for the treatment of colds, pain medications, drugs for heart disease, and any other remedies you have been prescribed or are taking at your own discretion. While such side effects as constipation, rash, insomnia, excessive tiredness, dizziness, lightheadedness, diarrhea, upset stomach, or vomiting tend to be short-lived and do not last for longer than a couple of hours, you have to call your health care provider if you have chest pain, trouble breathing, irregular heartbeat, swelling of the feet or hands, sore throat, weight gain, unusual bleeding or bruising. Also, if the mild side effects you originally had do not go away for a day and get worse talk to your health care provider as your dosage may need to be reconsidered. If your health care provider did not give any specific recommendations you can follow the instructions on the prescription label.