Ximelagatran chemical structure
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Melagatran

Ximelagatran (Exanta® or Exarta®, H 376/95) is an anticoagulant that has been investigated extensively as a replacement for warfarin that would overcome the problematic dietary, drug interaction, and monitoring issues associated with warfarin therapy. In 2006, its manufacturer AstraZeneca announced that it would not attempt to market ximelagatran after reports of hepatotoxicity (liver damage) during trials, and to discontinue its distribution in countries where the drug had been approved. more...

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Method of action

Ximelagatran was the first member of the drug class of direct thrombin inhibitors that can be taken orally. It acts solely by inhibiting the actions of thrombin. It is taken orally twice daily, and rapidly absorbed by the small intestine. Ximelagatran is a prodrug, being converted in vivo to the active agent melagatran. This conversion takes place in the liver and many other tissues through dealkylation and dehydroxylation (replacing the ethyl and hydroxyl groups with hydrogen).

Uses

Ximelagatran was expected to replace warfarin and sometimes aspirin and heparin in many therapeutic settings, including deep venous thrombosis, prevention of secondary venous thromboembolism and atrial fibrillation. The efficacy of ximelagatran for these indications had been well-documented (Eriksson et al 2003, Frances et al 2004, Schulman et al 2004).

An advantage, according to early reports by its manufacturer, was that it could be taken orally without any monitoring of its anticoagulant properties. This would have set it apart from warfarin and heparin, which require monitoring of the international normalized ratio (INR) and the partial thromboplastin time (PTT), respectively. A disadvantage recognised early was the absence of an antidote in case acute bleeding develops, while warfarin can be antagonised by vitamin K and heparin by protamine sulfate.

Side-effects

Ximelagatran was generally well tolerated in the trial populations, but a small proportion (5-6%) developed elevated liver enzyme levels, which prompted the FDA to reject an initial application for approval in 2004. The further development was discontinued in 2006 after it turned out hepatic damage could develop in the period subsequent to withdrawal of the drug. According to AstraZeneca, a chemically different but pharmacologically similar substance, AZD0837, is undergoing testing for similar indications.

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Research and Markets: The Cardiovascular Market Outlook to 2008:
From Business Wire, 4/28/04

Business Editors

DUBLIN, Ireland--(BUSINESS WIRE)--April 28, 2004

Research and Markets (http://www.researchandmarkets.com) has announced the addition of The Cardiovascular Market Outlook to 2008 to their offering.

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Leading players in the cardiovascular market

Summary

Introduction

Global market shares

Pfizer

Marketed products

R&D compounds

Cardiovascular portfolio sales forecasts

Merck & Co.

Marketed products

R&D compounds

Cardiovascular portfolio sales forecasts

Bristol-Myers Squibb

Marketed products

R&D compounds

Cardiovascular portfolio sales forecasts

Novartis

Marketed products

R&D compounds

Cardiovascular portfolio sales forecasts

AstraZeneca

Marketed products

R&D compounds

Cardiovascular portfolio sales forecasts

Aventis

Marketed products

R&D compounds

Cardiovascular portfolio sales forecasts

Drug profiles

Exanta (ximelagatran/melagatran)

Drug overview

Clinical trials

Drug indications

Patient potential

Marketing capabilities

Blockbuster potential

Crestor (rosuvastatin)

Drug overview

Clinical trials

Market potential

Sales and marketing capabilities

Pitavastatin

Drug overview

Clinical trials

Market potential: home and away

Benicar (olmesartan)

Overview

Clinical trial data

Side-effects

Requirement for further trials against irbesartan and candesartan

Patient potential

Marketing factors

Strategic analysis and blockbuster rating

Norvasc/Lipitor (amlodipine/atorvastatin) single pill

Overview

Potential for cross-risk factor single pill combinations

Likelihood of approval

Patient potential

Eplerenone

Drug overview

Clinical trial data

Side effect profile

Potential in heart failure

Patient potential

Marketing potential: the Pfizer effect

For more information visit http://www.researchandmarkets.com/reports/c1611

COPYRIGHT 2004 Business Wire
COPYRIGHT 2004 Gale Group

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