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| Seminars in Vascular Medicine 2005; 5: 254-258
DOI: 10.1055/s-2005-916164 |
Copyright © 2005 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. |
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Low Potential for Interactions Between Melagatran/Ximelagatran and Other Drugs, Food, or Alcohol |
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| Michael Wolzt1, Troy S. Sarich2, Ulf G. Eriksson3 |
1 Clinical Pharmacology, Allgemeines Krankenhaus Wien, Medical University of Vienna, Vienna, Austria
2 AstraZeneca LP, Wilmington, Delaware
3 AstraZeneca R&D, Mölndal, Sweden |
ABSTRACT
Vitamin K antagonists including warfarin are associated with numerous interactions with other drugs and foods. In clinical practice, this complicates the task of maintaining plasma levels of warfarin within a narrow therapeutic window and so maximizing protection against thromboembolic events while minimizing the risk of complications, particularly bleeding. In contrast, ximelagatran has a low potential for pharmacokinetic drug:drug and food interactions. There is no significant metabolism of melagatran, and the main route of elimination of melagatran is renal excretion that appears to occur via glomerular filtration. Most importantly, cytochrome P450 isoenzymes that mediate many drug:drug interactions are not involved in the biotransformation of ximelagatran to melagatran. No significant pharmacokinetic interactions have been observed when oral ximelagatran is administered with a range of agents, including diclofenac, diazepam, nifedipine, digoxin, atorvastatin, or amiodarone. The low potential for drug:drug interactions with ximelagatran is also supported by an analysis of the pharmacokinetic data from clinical studies in patients with atrial fibrillation receiving long-term treatment with oral ximelagatran. Increases of mean melagatran area under the curve and maximum plasma concentration (Cmax) of up to ∼80% have been observed when ximelagatran is co-administered with the macrolide antibiotics erythromycin or azithromycin, and the mechanism for this interaction is currently under investigation. The bioavailability of melagatran is not altered by co-administration with food or alcohol. The melagatran-induced prolongation of activated partial thromboplastin time (APTT), an ex vivo coagulation time assay used as a measure of thrombin inhibition, is not altered by other drugs [including digoxin, atorvastatin, acetylsalicylic acid (ASA), and amiodarone], food, or alcohol. The effect of melagatran on capillary bleeding time, which is prolonged as a result of the inhibition of thrombin-induced platelet aggregation, is relatively low and additive to the platelet-inhibitory effect of ASA.
KEYWORDS
Ximelagatran - pharmacokinetics - pharmacodynamics - food:drug interactions - cytochrome P450
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