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    Merck's Insomnia Drug Belsomra Clears Final DEA Hurdle

    The US Drug Enforcement Administration (DEA) has given a final and long-awaited approval to Merck to market its new insomnia drug Belsomra (suvorexant) as a Schedule IV drug. Background Belsomra is an orexin receptor antagonist intended to treat insomnia in patients. While its sponsor, Merck, has already obtained FDA approval to market the drug, it has been awaiting scheduling by DEA as a controlled substance under the Controlled Substances Act (CSA) . In February 2...