As propranolol and other beta blocker drugs are used to treat hypertension, or high blood pressure, and heart rate, some patients may experience fluctuating blood pressure levels or chronic low blood pressure. Propranolol has a lot of actions on the body and can be used for lots of conditions like high blood pressure, prevention of heart attacks, and preventing migraine headaches. Side Effects. Drug information provided by: IBM Micromedex. Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Learn about the potential side effects of propranolol. Includes common and rare side effects information for consumers and healthcare professionals. Propranolol is a beta-blocker. Beta-blockers affect the heart and circulation (blood flow through arteries and veins). Propranolol is used to treat tremors, angina (chest pain), hypertension (high blood pressure), heart rhythm disorders, and other heart or circulatory conditions. Propranolol: uses, dosage, side effects and warnings. Propranolol is a beta-blocker prescribed for many different uses, from helping symptoms of anxiety to preventing angina and migraines - we. Pictures of Inderal (Propranolol), drug imprint information, side effects for the patient. Side Effects. See also Warning and Precautions sections. Dizziness, lightheadedness, or tiredness may occur as your body adjusts to the medication. SIDE EFFECTS. The following adverse reactions have been observed, but there is not enough systematic collection of data to support an estimate of their frequency. Propranolol is a prescription drug. It comes in these forms: oral tablet, oral extended-release capsule, oral solution, and injectable. Propranolol oral tablet is only available in a generic form.