Abstract
In a double-blind randomized study, the profile of 24-h intragastric acidity and nocturnal gastric secretion was measured in a group of patients with healed gastric ulcer on placebo and 400 mg cimetidine b.d. and 800 mg nocte. Neither cimetidine regimen significantly decreased daytime intragastric acidity, but the 800 mg nocte dose caused a significant decrease in both nocturnal acidity (18.1 to 5.5 mmol/L; P less than 0.05) and acid output (11.0 to 1.7 mmol 7 h; P less than 0.05). The decrease in nocturnal gastric secretion by 400 mg cimetidine b.d. was not significant. As in duodenal ulcer, 800 mg cimetidine nocte will effectively suppress night-time acid secretion in patients with gastric ulcer while leaving acid secretion during the day unaffected.
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