Comparative study with oxmetidine and ranitidine on acid secretion and gastrin release in the dog.

The antisecretory potency of oxmetidine was compared with that of ranitidine for its action against gastric acid secretion induced by histamine and by 2-deoxy-D-glucose (2DG) in the conscious gastric-fistula dog. Oxmetidine, administered i.v. during histamine stimulation, was nearly as effective as ranitidine, with a similar duration of action, but it was about twice as potent as ranitidine against 2DG-stimulated acid secretion. In experiments with bombesin, both oxmetidine and ranitidine significantly decreased gastric acid secretion to a similar extent, without affecting plasma gastrin levels.