Effects of caffeine intake on the pharmacokinetics of melatonin, a probe drug for CYP1A2 activity.
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Hartter S, Nordmark A, Rose DM, Bertilsson L, Tybring G, Laine K
Effects of caffeine intake on the pharmacokinetics of melatonin, a probe drug for CYP1A2 activity.
Br J Clin Pharmacol. 2003 Dec;56(6):679-82.
- PubMed ID
- 14616429 [ View in PubMed]
- Abstract
AIMS: The aim of this study was to assess the influence of concomitant caffeine intake on the pharmacokinetics of oral melatonin, a probe drug for CYP1A2 activity. METHODS: Twelve healthy subjects, six smokers and six nonsmokers, were given melatonin (6 mg) either alone or in combination with caffeine (3 x 200 mg). Blood samples for the analysis of melatonin or caffeine and paraxanthine were taken from 1 h before until 6 h after intake of melatonin. Subjects were genotyped with respect to the CYP1A2*1F (C734A) polymorphism. RESULTS: When caffeine was coadministered the Cmax and AUC of melatonin were increased on average by 142% (P = 0.001, confidence interval on the difference 44, 80%) and 120% (P < 0.001, confidence interval on the difference 63, 178%), respectively. The inhibitory effect of caffeine was more pronounced in nonsmokers and in individuals with the *1F/*1F genotype. CONCLUSION: The results of this study revealed a pronounced effect of caffeine on the bioavailability of orally given melatonin, most probably due to inhibition of CYP1A2 activity.
DrugBank Data that Cites this Article
- Drug Enzymes
Drug Enzyme Kind Organism Pharmacological Action Actions Caffeine Cytochrome P450 1A2 Protein Humans UnknownSubstrateInhibitorDetails Melatonin Cytochrome P450 1A2 Protein Humans UnknownSubstrateDetails