Ximelagatran showed promise as an alternative to warfarin but was denied FDA approval due to increased coronary artery disease events and potential hepatic failure with long-term use.
Is ximelagatran a safe and effective alternative to warfarin and other anticoagulants for VTE and stroke prophylaxis?
Despite promising efficacy as an oral direct thrombin inhibitor, ximelagatran was denied FDA approval due to significant safety concerns including coronary artery disease events and hepatic failure.
Purpose. The chemistry, pharmacology, pharmacokinetics, clinical efficacy, dosage and administration, contraindications, and adverse effects of ximelagatran are reviewed. Summary. Ximelagatran is the first orally active direct thrombin inhibitor to be tested in Phase III clinical trials. After oral administration, ximelagatran is rapidly converted to its active metabolite, melagatran. Melagatran (after oral ximelagatran administration) predictably inhibits thrombin function without need for routine anticoagulation monitoring. Melagatran effectively inhibits both free and clot-bound thrombin—a potential pharmacodynamic advantage over heparin products. Melagatran has a half-life of 2.4–4.6 hours, necessitating twice-daily administration. Melagatran is primarily eliminated by the kidneys and has not been studied clinically in patients with severe renal failure. Ximelagatran has undergone 10 Phase III trials (6 for prophylaxis of venous thromboembolism VTE due to orthopedic surgery, 1 for initial treatment of VTE, 1 for long-term prevention of VTE recurrence, and 2 for stroke prophylaxis due to atrial fibrillation). Results were generally positive. AstraZeneca applied in December 2003 for marketing approval of ximelagatran for prevention of VTE after total knee replacement surgery, long-term prevention of VTE recurrence after standard therapy, and stroke prevention due to atrial fibrillation. FDA denied approval of ximelagatran for all indications, mainly because of increased rates of coronary artery disease events in ximelagatran recipients in some studies and the possibility of hepatic failure when the medication is used for long-term therapy. Conclusion. Ximelagatran has shown promise as a possible alternative to warfarin and other anticoagulants but will require further study to ensure its safety.
Michael P. Gulseth (Fri,) conducted a review in Venous thromboembolism and stroke prophylaxis in atrial fibrillation. Ximelagatran vs. Warfarin and other anticoagulants was evaluated. Ximelagatran showed promise as an alternative to warfarin but was denied FDA approval due to increased coronary artery disease events and potential hepatic failure with long-term use.