Prevent & relieve heartburn with Maximum Strength PEPCID AC® tablets with famotidine. Our strongest acid control formula helps control stomach acid all day or all night. Famotidine is used to treat and prevent ulcers in the stomach and intestines. Learn about side effects, interactions and indications. Pepcid (famotidine): H2 blocker for heartburn/GERD and ulcers. OTC/Rx dosing, onset, interactions, side effects, and prices by country. Learn how H2 Blockers, such as famotidine in PEPCID® products, help provide lasting heartburn relief and lower the amount of acid your stomach produces. 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. Famotidine (Pepcid and Zantac) treats conditions that cause too much stomach acid, like heartburn, stomach ulcers and reflux disease. 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. Pepcid (Famotidine) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. 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. Find patient medical information for Famotidine (Pepcid, Zantac 360) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings.