Trial reportEuropean journal of clinical pharmacology2009
Effects of allicin on CYP2C19 and CYP3A4 activity in healthy volunteers with different CYP2C19 genotypes.
Trial report in European journal of clinical pharmacology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
8 citing papers in PubMed, 21 citations in OpenAlex.
- Omeprazole limited sampling strategies to predict area under the concentration-time curve ratios: implications for cytochrome P450 2C19 and 3A phenotyping.European journal of clinical pharmacology · 2012Trial
- Therapeutic potential of allicin against viral infections: Mechanisms and safety profile (Review).Experimental and therapeutic medicine · 2026Review
- Therapeutic role of allicin in gastrointestinal cancers: mechanisms and safety aspects.Discover oncology · 2025Review
- Performance Verification of CYP2C19 Enzyme Abundance Polymorphism Settings within the Simcyp Simulator v21.Metabolites · 2022Article
- Drug-Herb Interactions among Thai Herbs and Anticancer Drugs: A Scoping Review.Pharmaceuticals (Basel, Switzerland) · 2022Article
- Potential herb-drug interaction in the prevention of cardiovascular diseases during integrated traditional and Western medicine treatment.Chinese journal of integrative medicine · 2015Review
- Prediction of relative in vivo metabolite exposure from in vitro data using two model drugs: dextromethorphan and omeprazole.Drug metabolism and disposition: the biological fate of chemicals · 2012Article
- Rationalization and prediction of in vivo metabolite exposures: the role of metabolite kinetics, clearance predictions and in vitro parameters.Expert opinion on drug metabolism & toxicology · 2010Review
Corrections and comments
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Authors and funding
12 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveTo investigate the interaction between allicin and omeprazole and to observe the effects of allicin on CYP2C19 and CYP3A4 activity in healthy Chinese male volunteers with different CYP2C19 genotypes.
methodsEighteen subjects (six CYP2C19*1/CYP2C19*1, four CYP2C19*1/CYP2C19*2, two CYP2C19*1/ CYP2C19*3, and six CYP2C19*2/ CYP2C19*2) were enrolled in a two-phase randomized crossover trial. In each phase, all subjects received placebo or a 180 mg allicin capsule once daily for 14 consecutive days. The pharmacokinetics of omeprazole (20 mg orally on day 15) was determined for up to 12 h following administration by high-performance liquid chromatography.
resultsIn carriers of the CYP2C19*1/CYP2C19*1 and CYP2C19*1/CYP2C19*2 or *3 genotype, allicin treatment increased the peak plasma concentration (C(max)) of omeprazole by 49.7 +/- 7.2 (p < 0.001) and 54.2 +/- 9.2% (p < 0.001), and increased the area under the plasma time-concentration curve (AUC(0-infinity)) of omeprazole by 48.1 +/- 9.0 (p = 0.001) and 73.6 +/- 26.7% (p < 0.001), respectively. The ratio of AUC(0-infinity) of 5-hydroxyomeprazole to omeprazole (a marker for CYP2C19 activity) decreased significantly (p < 0.001 and p = 0.001, respectively). However, no pharmacokinetic parameters were significantly changed by allicin in CYP2C19*2/CYP2C19*2. The C(max) and AUC(0-infinity) of omeprazole sulfone were unchanged in all three genotypes.
conclusionsAllicin reduced the metabolism of omeprazole by inhibiting CYP2C19 activity in individuals with the CYP2C19*1/CYP2C19*1 and CYP2C19*1/CYP2C19*2 or *3 genotypes, but not in those with the CYP2C19*2/ CYP2C19*2 genotype. Allicin did not significantly affect the activity of CYP3A4 in all subjects.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.