Abstract
Introduction
The aim of therapeutic regimens using proton pump inhibitors (PPIs) in patients with acid-related diseases is to potently inhibit acid secretion for the full 24 h. However, optimum treatment is still unclear because the pharmacodynamics of PPIs differ among CYP2C19 genotypes and most of the previous studies have had loss of sample power.
Methods
Using pH monitoring, we compared acid inhibition at standard dosage of omeprazole (20 mg, 50 times), lansoprazole (30 mg, 68 times), and rabeprazole (10 mg, 65 times) in Helicobacter pylori-negative healthy young Japanese volunteers.
Results
Median pH with rabeprazole was 5.4 (3.3–7.5), which was significantly greater than with either omeprazole [4.4 (2.1–7.3)] or lansoprazole [4.8 (3.5–6.4)] (both P < 0.05). Median 24-h pH differed among the different CYP2C19 genotypes in all three PPIs. In CYP2C19 extensive metabolizers (EMs), the genotype that is refractory to PPI treatment, median pH with omeprazole, lansoprazole, and rabeprazole was 3.8 (2.1–4.4), 4.5 (3.5–5.3) and 4.8 (3.3–7.5), respectively.
Discussion
Treatment with the selected PPIs at their standard dosages had difficulty maintaining acid inhibition for a full 24 h, especially in CYP2C19 EM. However, rabeprazole has the merit of less influence of CYP2C19 genotype compared with the other PPIs.
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Abbreviations
- CYP2C19:
-
S-mephenytoin 4′-hydroxylase
- EM:
-
Extensive metabolizer
- IM:
-
Intermediate metabolizer
- PPI:
-
Proton pump inhibitor
- PM:
-
Poor metabolizer
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Acknowledgments
This study was supported by a grant-in-aid from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (22790640 and 24590912).
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None of the authors has any conflict of interest related to this study.
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Sugimoto, M., Shirai, N., Nishino, M. et al. Comparison of acid inhibition with standard dosages of proton pump inhibitors in relation to CYP2C19 genotype in Japanese. Eur J Clin Pharmacol 70, 1073–1078 (2014). https://doi.org/10.1007/s00228-014-1713-y
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DOI: https://doi.org/10.1007/s00228-014-1713-y