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Milestone Pharma slumps after FDA declines to approve heart rhythm nasal spray

ReutersMar 28, 2025 11:46 AM

Shares of drug developer Milestone Pharmaceuticals MIST.O fall 62.7% to 84 cents premarket

US FDA declined to approve MIST's nasal spray, Cardamyst, to treat a type of heart condition, company says

FDA raised no concerns about clinical safety or efficacy, but highlighted two key chemistry, manufacturing and controls issues - MIST

Issues include needing additional information on nitrosamine impurities, cancer-causing compounds formed during manufacturing and an inspection of a testing facility

Shares up 25% in the last 12 months, as of last close

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