While most people have no difficulties when taking famotidine, side effects are possible. This eMedTV page lists common side effects (like constipation and dizziness. Consumer information about the medication FAMOTIDINE ORAL (Pepcid), includes side effects, drug interactions, recommended dosages, and storage information. Easytoread patient leaflet for Cimetidine Tablets. Includes indications, proper use, special instructions, precautions, and possible side effects. Explains the medication cimetidine (Tagamet), a drug used in promoting the healing of active stomach and duodenal ulcers, and in reducing ulcer pain. Cimetidine, sold under the brand name Tagamet among others, is a histamine H 2 receptor antagonist that inhibits stomach acid production. Famotidine, sold under the trade name Pepcid among others, is a histamine H 2 receptor antagonist that inhibits stomach acid production. While several human medications may be highly toxic to dogs, the use of Pepcid AC for Dog Upset Stomach is often veterinarian recommended. Monograph Type: Systemic Drug; Drug Class: H 2Receptor Antagonist; Trade Name: Pepcid concluded that oral omeprazole provided superior gastric acid. Untitled Document a Famotidine is used to treat and prevent ulcers in the stomach and intestines. Learn about side effects, interactions and indications. Buy Equate Heartburn Relief Acid Reducer, Cimetidine 200 mg, 60 Tablets (Compare to Tagamet HB 200) on Amazon. com FREE SHIPPING on qualified orders Famotidine. As this eMedTV Web page explains, people who are allergic to famotidine should not take it. This segment also stresses the importance of discussing your individual. Famotidine and ranitidine act in much the same way, but they have a different molecular structure, and one is stronger than the.