The FDA updated its warning label for Singulair, a drug marketed by Merck for asthma. The drug carries a black box warning (also called a boxed warning), which is the FDA’s strongest warning. The National Center for Health Research is helping to better inform the public that “the black box warning for Singulair describes psychiatric side effects such as aggression, depression, agitation, sleep disturbances, suicidal thoughts, and suicide.”

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