Compare to the active ingredient in Maximum Strength Pepcid AC. Don’t let heartburn rule your life or keep you from enjoying a nice meal or everyday activities with friends and family. Just one tablet of Equate Maximum Strength Famotidine Tablets, 20 mg prevents and relieves heartburn associated with acid indigestion brought on by eating and drinking certain foods and beverages. Prevents heartburn when taken at any time 10 to 60 minutes before eating. Swallow one tablet with a glass of water to relieve heartburn. Do not use more than 2 tablets in 24 hours. The active ingredient, famotidine 20 mg, is an H2-blocker, which works as an acid reducer to diminish the quantity of acid produced in the stomach. This maximum strength heartburn medicine is intended for adults and children 12 years and over. Gluten free heartburn relief.