AstraZeneca faces new patent fight over Nexium

India's Ranbaxy has launched a bid to manufacture a copycat version of AstraZeneca's blockbuster Nexium. The Anglo-Swedish drug giant immediately issued its own challenge, saying that it controlled Nexium's patent until 2018 and that any court fight over the patent would likely take years to play out. Teva Pharmaceuticals recently made a bid to go after another AstraZeneca drug, Seroquel.

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