| アブストラクト | AIM: We aimed to assess if dicloxacillin/flucloxacillin reduces the therapeutic efficacy of direct oral anticoagulants (DOACs) and the underlying molecular mechanism. METHODS: In a randomized, crossover study, we assessed whether dicloxacillin reduces oral absorption of drugs through P-glycoprotein (P-gp) during 10 and 28 days of treatment. To study the impact of dicloxacillin/flucloxacillin on intestinal and hepatic expression of P-gp in vitro, we usd LS174T cells and 3D spheroids of primary human hepatocytes. Finally, we used nationwide Danish health registries and the UK's Clinical Practice Research Datalink to estimate hazard ratios (HRs) for the risk of stroke and systemic embolism following dicloxacillin/flucloxacillin exposure among DOAC users, using phenoxymethylpenicillin and amoxicillin as active comparators. RESULTS: Dicloxacillin reduced the area under the curve of dabigatran to a geometric mean ratio 10 days of 0.67 (95% confidence interval [CI]: 0.42-1.1) and geometric mean ratio 28 days of 0.72 (95% CI: 0.39-1.4), suggesting reduced oral absorption via increased P-gp expression. In vitro, dicloxacillin raised P-gp expression in both intestinal and liver cells, while flucloxacillin only affected liver cells. In the pharmacoepidemiologic study, dicloxacillin and flucloxacillin were not associated with increased risk of stroke/systemic embolism (dicloxacillin vs. phenoxymethylpenicillin HR: 0.93, 95% CI: 0.72-1.2; flucloxacillin vs. amoxicillin HR: 0.89, 95% CI: 0.51-1.5). CONCLUSIONS: Dicloxacillin increases expression of intestinal P-gp, leading to reduced oral absorption of dabigatran. However, concomitant use of dicloxacillin/flucloxacillin was not associated with stroke and systemic embolism among DOAC users, suggesting no clinical impact from the drug-drug interaction between dicloxacillin/flucloxacillin and DOACs. |
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| ジャーナル名 | British journal of clinical pharmacology |
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| Pubmed追加日 | 2024/8/20 |
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| 投稿者 | Iversen, Ditte B; Dunvald, Ann-Cathrine Dalgard; Ernst, Martin Thomsen; Abtahi, Shahab; Souverein, Patrick; Klungel, Olaf; Jeppesen, Glenn Brode; Nielsen, Flemming; Brosen, Kim; Hammer, Helen S; Potz, Oliver; Damkier, Per; Jarvinen, Erkka; Pottegard, Anton; Stage, Tore B |
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| 組織名 | Clinical Pharmacology, Pharmacy and Environmental Medicine, Department of Public;Health, University of Southern Denmark, Odense, Denmark.;Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht Institute for;Pharmaceutical Sciences, Utrecht University, the Netherlands.;Signatope GmbH, Reutlingen, Germany.;NMI Natural and Medical Sciences Institute at the University of Tuebingen,;Reutlingen, Germany.;Department of Clinical Pharmacology, Odense University Hospital, Odense, Denmark.;Department of Clinical Research, University of Southern Denmark, Odense, Denmark. |
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| Pubmed リンク | https://www.ncbi.nlm.nih.gov/pubmed/39160000/ |
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