Propranolol is a prescription medicine efficient in the prevention of chest pain and migraine headaches. It is also often used to treat abnormal heart rhythms, high blood pressure and heart disease. Keep a list of all the medicines you are taking at the moment. You can demonstrate this list to your health care provider to make sure you remember all the medicines you are taking and no drug interaction is possible. Make sure you know which side effects are mild and which ones need to be reported to your doctor via the phone or personally. For instance, such serious side effects as swelling of the feet or hands, weight gain, chest pain, trouble breathing, sore throat, unusual bleeding or bruising, and irregular heartbeat require immediate medical attention, so make sure you notify your health care provider of the fact of having them. You must keep all of your doctor's appointments to make sure your condition is monitored and you are benefitting from propranolol. You may be required to take your pulse regularly, and your health care provider will teach you how do it. This way you will be able to understand just the way your body responds to this medicine. People with other health conditions that require treatment must report them to their doctor before a prescription is written. If you have lung disease, liver or kidney disease, thyroid problems, asthma, diabetes, heart disease, or severe allergies, especially to the active ingredient of this drug, you may not be able to take it, or your condition will have to be monitored very closely for any side effects or complications.