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Antisecretory and antiulcer effect of the H 2 ‐receptor antagonist famotidine in the rat: comparison with ranitidine
Author(s) -
Scarpignato Carmelo,
Tramacere Roberto,
Zappia Luciana
Publication year - 1987
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1987.tb11307.x
Subject(s) - famotidine , ranitidine , histamine h2 receptor , cysteamine , gastric emptying , antagonist , gastric acid , pharmacology , medicine , potency , stomach , endocrinology , chemistry , receptor , in vitro , biochemistry
1 The effects of the new H 2 ‐receptor antagonist famotidine, administered orally, on gastric secretion and emptying as well as on experimentally‐induced gastric and duodenal ulcers were studied in the rat. Ranitidine was used as a reference compound. 2 Both compounds inhibited acid secretion in a dose‐dependent manner. Calculated ED 50 values were 0.80 and 6.84 mg kg −1 for famotidine and ranitidine, respectively. However, the duration of the antisecretory action was the same for both drugs. 3 The effect of the two drugs, administered at equiactive antisecretory doses, on gastric emptying was different. Ranitidine significantly accelerated the emptying rate whereas famotidine had no effect. 4 Famotidine reduced, in a dose‐dependent manner, ulcer incidence in stomachs of dimaprit‐treated rats and in duodena of cysteamine‐treated animals with a potency respectively 2 and 7 times higher than that of ranitidine. 5 Famotidine is therefore an effective antisecretory and untiulcer compound. Its potency, but not its efficacy, is higher than that of ranitidine. Moreover, the duration of the antisecretory action is virtually the same for both drugs.