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New stroke drug looks set to replace warfarin
Published in The Saudi Gazette on 31 - 08 - 2009

Patients at risk of stroke due to an irregular heartbeat should soon have a viable alternative to 50-year-old warfarin, after a new pill from Boehringer Ingelheim beat expectations in a major clinical study.
The strong showing for the unlisted German company's drug Pradaxa impressed experts attending the annual meeting of the European Society of Cardiology (ESC) and promises to change clinical practice in the management of atrial fibrillation (AF). It also sets a high bar for Bayer and Johnson & Johnson, whose rival drug and big blockbuster hope Xarelto is about a year behind in development.
A pivotal trial involving more than 18,000 patients found a 150 milligram dose of Pradaxa, or dabigatran, given twice daily reduced the risk of stroke and systemic embolism by 34 percent compared to warfarin. There was no increase in the risk of major bleeding, a common problem with anticoagulants, and there were no signs of liver damage, an issue that sank AstraZeneca's warfarin replacement candidate Exanta five years ago.
A lower 110 mg showed similar efficacy to warfarin and carried a lower bleeding risk. “These results are very good,” said Fausto Pinto, director of the Lisbon Cardiovascular Institute and program chairman of the ESC. “It's a very good alternative to warfarin and will probably replace warfarin.”
Other oral anticoagulants in development include Pfizer and Bristol's apixaban and Merck's betrixaban, both of which are further behind Pradaxa and Xarelto in testing. Doctors have long wanted an alternative to warfarin, which was first developed as rat poison and is difficult to use. Patients need regular blood tests and must avoid certain foods. Yet the drug, sold under the brand name Coumadin by Bristol-Myers Squibb and also available as a cheap generic, has remained the gold standard for millions of patients with AF.
But Pradaxa was not without problems. Patients taking the new drug often suffered dyspepsia, which caused some to drop out of the trial, and there was also a puzzlingly higher number of heart attacks seen in the Pradaxa arm compared to warfarin. Coupled with the fact that Boehringer's study was open-label rather than doubled-blinded – meaning patients and doctors knew which drug was being used – the side effects mean regulators will study Pradaxa very closely before approving it.


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