Pepcid is used to treat ulcers in the stomach and for conditions where the stomach produces too much acid. Learn about side effects, interactions and indications. Description Famotidine is used to treat stomach ulcers (gastric and duodenal), erosive esophagitis (heartburn or acid indigestion), and gastroesophageal reflux disease (GERD). GERD is a condition where the acid in the stomach washes back up into the esophagus. It is also used to treat certain conditions where there is too much acid in the stomach (eg, Zollinger-Ellison syndrome, multiple. Famotidine (Pepcid and Zantac) treats conditions that cause too much stomach acid, like heartburn, stomach ulcers and reflux disease. Famotidine is used to treat and prevent ulcers in the stomach and intestines. Learn about side effects, interactions and indications. Pepcid (Famotidine) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Learn how H2 Blockers, such as famotidine in PEPCID® products, help provide lasting heartburn relief and lower the amount of acid your stomach produces. Find patient medical information for Famotidine (Pepcid, Zantac 360) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Famotidine, sold under the brand name Pepcid among others, is a histamine H 2 receptor antagonist medication that decreases stomach acid production. [4] It is used to treat peptic ulcer disease, gastroesophageal reflux disease, and Zollinger–Ellison syndrome. [4] It is taken by mouth or by injection into a vein. [4] It begins working within an hour. [4] Common side effects include headache. Get Pepcid heartburn relief products in tablets, chewables, and maximum strength formats. PEPCID® is the original brand with the active ingredient famotidine which is a histamine-2 blocker (H2 blocker) that provides relief for occasional heartburn.