Pepcid Ac^® Maximum Strength Tablets work to relieve and prevent tough heartburn and acid indigestion. Containing twice as much of the acid-reducer ingredient famotidine as Pepcid Ac^®, these tablets are clinically proven to give fast and effective relief from heartburn, acid indigestion, and sour or upset stomach due to excess stomach acid. Taken 10 to 15 minutes before a meal, this tablet can prevent symptoms brought on by eating or drinking food and beverages. You can take just one Pepcid Ac^® Maximum Strength Tablet to control stomach acid for up to 12 hours. Pepcid Ac^® Maximum Strength Tablets are easy to swallow and are available in 25-count and 50-count packages.