Pepcid (Famotidine) Dosage and Side Effects Prescription PEPCID is used to treat conditions such as ulcers (sores in the stomach lining or small intestine), gastroesophageal reflux disease or GERD (when stomach acid irritates the esophagus, causing heartburn and other problems), and certain tumors in the pancreas or the small intestine (Zollinger-Ellison … Continue reading Pepcid (Famotidine)