<unk> , sold under the brand name Tagamet among others, is a histamine H2 receptor antagonist that inhibits stomach acid production. It is mainly used in the treatment of heartburn and peptic ulcers. The development of longer-acting H2 receptor antagonists with fewer drug interactions and adverse effects, such as ranitidine and famotidine, decreased the use of<unk> , and though it is still used,<unk>  is no longer among the more widely used of the H2 receptor antagonists.<unk>  was developed in 1971 and came into commercial use in 1977.<unk>  was approved in the United Kingdom in 1976, and was approved in the United States by the Food and Drug Administration for prescriptions in 1979.
Cimetidine
Azacitidine
Ranitidine
Sucralfate
Dexlansoprazole
Lansoprazole
Rabeprazole
Pantoprazole