Boxed warning added to Merck & Co's Singulair

5 March 2020

The US Food and Drug Administration has added a boxed warning to Merck & Co’s (NYSE: MRK) asthma med Singulair (montelukast), as well as generic forms of the drug.

The most prominent notice will be added to the product’s label, in order to strengthen an existing warning about the risk of neuropsychiatric events associated with the drug.

While sales of the former blockbuster have declined in the face of generic competition, the product brought in a handy $698 million for the New Jersey-based firm in 2019.

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