Reduces and neutralizes acid. Contains Calcium. Relieves heartburn due to acid indigestion. Works with just one tablet! A Non-Prescription Stomach Medicine: Pepcid Complete combines an acid reducer (Famotidine) with antacids (Calcium Carbonate and Magnesium Hydroxide) to relieve heartburn in two different ways: Acid reducers decrease the production of new stomach acid; antacids neutralize acid that is already in the stomach. The active ingredients in Pepcid Complete have been used for years to treat acid-related problems in millions of people safely and effectively. Just 1 tablet relieves heartburn due to acid indigestion. Excess Acid: A Burning Problem – It is normal for the stomach to produce acid, especially after consuming food and beverages. However, acid in the stomach may move up into the wrong place (the esophagus), causing burning pain and discomfort that interfere with everyday activities. Heartburn – Caused by Acid in the Esophagus: Burning pain/discomfort in esophagus. A valve-like muscle called the lower esophageal sphincter (LES) is relaxed in an open position. Acid moves up from stomach. Proven Effective in Clinical Studies: In clinical studies, Pepcid Complete was significantly better than placebo tablets (tablets without medicine) in relieving heartburn. The acid reducing benefits of Pepcid AC + The neutralizing benefits of antacids = Combined in a single chewable tablet.