Compare ours to the active ingredient in Maximum Strength Pepcid AC. Feeling the burn 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. Equate Maximum Strength Famotidine Tablets, 20 mg helps prevent meal-induced heartburn when taken at least 10-60 minutes before eating and lasts up to 12 hours. The active ingredient in Equate Maximum Strength Famotidine Tablets, 20 mg is an H2-blocker, which works as an acid reducer to help relieve heartburn and compares to the active ingredient in Maximum Strength Pepcid AC. This maximum strength heartburn medicine is intended for adults and children 12 years and over. Equate Maximum Strength Famotidine Tablets, 20 mg is free of gluten.