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Effects of rabeprazole, 20 mg, or esomeprazole, 20 mg, on 24-h intragastric pH and serum gastrin in healthy subjects.

Author(s): Warrington S, Baisley K, Boyce M, Tejura B, Morocutti A, Miller N

Affiliation(s): Hammersmith Medicines Research, Central Middlesex Hospital, Acton Lane, London, UK. swarrington@hmrlondon.com

Publication date & source: 2002-07, Aliment Pharmacol Ther., 16(7):1301-7.

Publication type: Clinical Trial; Randomized Controlled Trial

AIM: To compare the antisecretory effects of rabeprazole and esomeprazole in an open, randomized, two-way crossover, clinical pharmacology study. METHODS: Twenty-four healthy subjects (14 men, 10 women; mean age 26.8 years) received rabeprazole 20 mg or esomeprazole 20 mg daily on days 1-5, with a 14-day 'wash-out'. Intragastric pH was recorded continuously, and serum gastrin measured, on days 0, 1 and 5. RESULTS: On day 0, mean intragastric pH AUC was significantly higher before the esomeprazole than before the rabeprazole treatment in four of the five time intervals analysed. On days 1 and 5, mean intragastric pH AUC was higher after rabeprazole than esomeprazole during 5-11, 14-24 and 0-24 h after dosing. Mean pH AUC in the first 5 h after dosing on day 5 was higher after esomeprazole than rabeprazole (P=0.012). On day 1, mean per cent times pH > 3 and > 4 were significantly greater after rabeprazole than esomeprazole during 0-14, 14-24 and 0-24 h. On day 5, mean serum gastrin AUC0-4 was higher (P = 0.017) after rabeprazole than esomeprazole (335 vs. 316 pg/mL.h). CONCLUSION: In this clinical pharmacology study, rabeprazole 20 mg daily was more effective than esomeprazole 20 mg daily in increasing intragastric pH and maintaining pH > 3 and > 4. On day 5, mean pH AUC was higher after esomeprazole than rabeprazole.

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