Propranolol may cause harmful effects for the fetus if taken during pregnancy; [16] however, its use during breastfeeding is generally considered to be safe. [17] It is a non-selective beta blocker which works by blocking β-adrenergic receptors. [11] Propranolol was patented in 1962 and approved for medical use in 1964. [18] Propranolol is a beta-blocker that is used to treat high blood pressure, angina, anxiety, heart rhythm disorders, migraine prevention, and other heart or circulatory conditions. Propranolol is a beta-blocker prescribed to treat a number of different conditions such as anxiety, high blood pressure, and angina. If you are unsure why you are taking it, speak with your doctor. The most common side effects of propranolol are feeling tired, cold hands and feet, disturbed sleep, and stomach upset. Common and serious Propranolol side effects, who's most at risk, and when to call your doctor. Check Propranolol availability at pharmacies near you. Propranolol may cause heart failure in some patients. Check with your doctor right away if you are having chest pain or discomfort, dilated neck veins, extreme fatigue, irregular breathing, an irregular heartbeat, swelling of the face, fingers, feet, or lower legs, or weight gain. This medicine may cause changes in your blood sugar levels. Find patient medical information for Propranolol (Inderal LA, Innopran XL, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Learn about the side effects of propranolol, from common to rare, for consumers and healthcare professionals. Read on to learn the common and rare side effects for propranolol, and when to reach out to your healthcare team for further guidance. NHS medicines information on side effects of propranolol and what you can do to cope. NHS medicines information on propranolol – what it's used for, side effects, dosage and who can take it.