Pepcid AC Original Strength Heartburn Relief Tablets with famotidine provide fast-acting prevention and relief of heartburn associated with acid indigestion and sour stomach. Each acid controlling tablet contains 10 milligrams of famotidine, a known acid reducer that helps relieve heartburn brought on by eating or drinking certain food and beverages. Keep a package in your bag or at your desk for easy-access to treat heartburn on-the-go. You can take Original Strength Pepcid AC as little as 15 minutes before eating, and know you have strength on your side all day or all night.** It can calm the acid flare-up with relief that starts working in minutes.*** * Prevents heartburn if taken 15 to 60 minutes before a meal. ** Based on 9-hour acid control studies during the day and 12-hour acid control studies during the night. Acid control does not imply symptom relief. *** Pepcid AC starts to relieve heartburn in 15 to 30 minutes.