InterMune plunges as US FDA calls for additional testing of IPF drug Esbriet; agency clears label change for Shire's Vyvanse

5 May 2010

InterMune saw a melt-down in its share price, after it revealed that the US Food and Drug Administration had issued a complete response letter for the New Drug Application for its potential blockbuster Esbriet (pirfenidone) in the treatment of patients with idiopathic pulmonary fibrosis to reduce decline in lung function, calling for an additional clinical trial to support the efficacy of the drug in IPF patients.

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