Merck Sued Over Asthma Drug's Alleged Psychiatric Effects

Law360 (May 7, 2021, 6:46 PM EDT) -- Merck & Co. Inc. has been hit with a lawsuit in New Jersey state court by a woman who claims her use of asthma medicine Singulair as a teen led to neuropsychiatric disorders and the pharmaceutical giant belatedly warned consumers despite its longtime knowledge of the drug's risks.

In a complaint filed Thursday, Rachel McHenry and her mother, Brenda Lee Danielson, trace the history of Singulair from Merck's patent application in 1996 to the company's insertion of a serious label warning about a year ago. They say extensive, ongoing testing of the drug's active ingredient montelukast indicates a link between its...

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