Along with its needed effects, propranolol (the active ingredient contained in Inderal) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. The feedback you provide will help us show you more relevant content in the future. Common Questions and Answers about Long term propranolol use inderal But while those extra puffs of the inhaler might not prevent an asthma attack, they can increase the risk of side effects–including thrush, a yeast infection in the mouth. Find patient medical information for Inderal Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Jukic on long term effects of propranolol: none -- but your body may develop tolerance. 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. I am considering starting inderal for my anxiety/occasional panic, but as an educated consumer, I would like to know about the long term effects of others' who have taken it. Clinical studies have shown that Inderal is tolerated well even in long-term use and is safe. However, the drug is not devoid of side effects and should only be taken as per the doctor’s advice. Clinical studies have shown that Inderal is tolerated well even in long-term use and is safe. However, the drug is not devoid of side effects and should only be taken as per the doctor’s advice. However, the drug is not devoid of side effects and should only be taken as per the doctor’s advice. Discover your genetic likelihood for type 2 diabetes and how to make healthy life choices.