, Volume 39, Issue 1, pp 21-25

The comparative effects of single intravenous doses of omeprazole and famotidine on intragastric pH

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Ten healthy Helicobacter pylori-negative male subjects participated in this randomized, double-masked, two-way crossover study. Intragastric pH was monitored continuously for 4 h after a single intravenous administration of omeprazole 20 mg and after a single intravenous administration of famotidine 20 mg. The administration of the two agents was separated by a 7-day washout period.


In all ten subjects, the length of time that intragastric pH remained over 3, during the 0- to 3- and 0- to 4-h study periods, was greater after famotidine treatment than after treatment with omeprazole, and famotidine increased the average pH during the 0 to 3- and 0 to 4-h study periods significantly more than omeprazole did. During the 4-h study period, famotidine provided a longer duration of pH of more than 2, 3, 3.5, 4, 5, 6, and 7, compared to omeprazole.


In Helicobacter pylori-negative healthy male subjects, an intravenous dose of 20 mg famotidine increased intragastric pH more rapidly than intravenous omeprazole 20 mg.