Maximum Strength Pepcid AC provides fast-acting prevention and relief of heartburn associated with acid indigestion and sour stomach. These acid neutralizing tablets contain 20 mg of famotidine, a known acid reducer that helps control 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 on-the-go indigestion. You can take Maximum Strength Pepcid AC as little as 10 minutes before eating, and know you have strength on your side all day or all night.***Prevents heartburn if taken 10 to 60 minutes before a meal.