What Are H2 Blockers?
H2 blockers are a class of medications used to treat a variety of gastrointestinal conditions. They work by decreasing the amount of acid produced by the stomach. Some of the conditions they can treat include:
- Gastric ulcers (stomach ulcers)
- Erosive esophagitis
- Gastroesophageal reflux disease (GERD).
H2 blockers are taken by mouth, usually one to four times per day. Common side effects include constipation, nausea, diarrhea, and abdominal pain (stomach pain).
Four prescription H2 blockers are available:
Some of the over-the-counter (OTC) H2 blockers include:
- Cimetidine (Tagamet HB®)
- Famotidine (Pepcid AC®, Pepcid® Complete)
- Ranitidine (Zantac Acid Reducer®).
(Click H2 Blockers for more details on what these medications are used for, what to expect during treatment, and more.)