Perspective on the gastric antisecretory effects of misoprostol in man.

Misoprostol, a synthetic prostaglandin E1 analog, has been found to be safe and effective for the treatment of peptic ulcer disease. This brief overview summarizes the gastric antisecretory effects of misoprostol in healthy human subjects using randomized, double-blind, placebo-controlled studies. Misoprostol effectively and dose-dependently inhibited basal gastric acid secretion at single doses of 50, 100 and 200 mcg/subject. Furthermore, misoprostol effectively inhibited meal-, histamine-, coffee- and tetragastrin-stimulated gastric acid secretion. The inhibition of meal-stimulated gastric acid secretion was not a consequence of the reduction of serum gastrin. In addition, misoprostol inhibited nocturnal gastric acid secretion. In these studies, the titratable acidity, volume, acid output and pepsin activity were inhibited by misoprostol. The extent of the secretory inhibition achieved with the 200 mcg dose of misoprostol was comparable to that of cimetidine administered at a 300 mg dose. The duration of the gastric antisecretory actions was in the order of 3 to 5 hours. We conclude that misoprostol is a potent inhibitor of gastric acid secretion in man.