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Pharmacokinetic and Pharmacodynamic Properties of Lafutidine after Postprandial Oral Administration in Healthy Subjects: Comparison with Famotidine
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- Ikawa Kazuro
- Department of Clinical Pharmacotherapy, Hiroshima University
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- Shimatani Tomohiko
- Department of General Medicine, Hiroshima University
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- Hayato Seiichi
- Department of Clinical Pharmacotherapy, Hiroshima University
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- Morikawa Norifumi
- Department of Clinical Pharmacotherapy, Hiroshima University
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- Tazuma Susumu
- Department of General Medicine, Hiroshima University
Bibliographic Information
- Other Title
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- Pharmacokinetic and pharmacodynamic properties of lafutidine after postprandial oral administration in health subjects: comparison with famotidine
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Description
Lafutidine, a histamine H2-receptor antagonist, inhibits gastric acid secretion during the daytime, however, the relationship between the plasma concentration and the drug response remains unclear. The aim of this study was to compare the pharmacokinetic and pharmacodynamic properties of lafutidine and famotidine following postprandial oral administration. After a lafutidine tablet (10 mg), famotidine tablet (20 mg), or water only (control) was administered, blood samples were taken and intragastric pH was measured. The plasma concentrations of lafutidine and famotidine were determined by HPLC, and the median intragastric pH values per 30 min were used as the degrees of gastric acid suppression. Data were analyzed based on a one-compartment pharmacokinetic model and a sigmoid Emax pharmacodynamic model. Lafutidine plasma concentrations rapidly increased after administration; famotidine required some time to increase the plasma concentrations, requiring an absorption lag time in the pharmacokinetic model. Between the plasma concentration and ΔpH (the difference in intragastric pH by the drug vs. control), lafutidine showed an anticlockwise hysteresis loop which indicated equilibration delay between the plasma concentration and effect site, requiring an effect site compartment in the pharmacodynamic model; famotidine showed more parallel relationship. These results indicated that the pharmacokinetic and pharmacodynamic properties of lafutidine after postprandial oral administration were different from those of famotidine at least 4.5 h after dosing.
Journal
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- Biological and Pharmaceutical Bulletin
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Biological and Pharmaceutical Bulletin 30 (5), 1003-1006, 2007
The Pharmaceutical Society of Japan
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Details 詳細情報について
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- CRID
- 1390282679603755392
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- NII Article ID
- 110006273307
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- NII Book ID
- AA10885497
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- ISSN
- 13475215
- 09186158
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- NDL BIB ID
- 8714599
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- PubMed
- 17473452
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- JaLC
- IRDB
- NDL Search
- Crossref
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed
