Why Biohaven Stock Dove by Nearly 20% on Thursday

Core Viewpoint - Biohaven's stock experienced significant volatility, dropping nearly 20% due to a regulatory delay regarding its promising drug, trotziluzole, despite a generally positive market day for other stocks [1][2]. Regulatory Update - The FDA has extended the Prescription Drug User Fee Act (PDUFA) date for Biohaven's drug, troriluzole, by three months, with a new decision expected in the fourth quarter of this year [4]. - The extension is due to the FDA's need for additional time to review recent submissions from Biohaven [5]. Drug Potential - Troriluzole targets spinocerebellar ataxia (SCA), a rare brain disorder with no current treatment options, and has received fast-track, priority review, and orphan drug designation from the FDA [6]. - Investor sentiment remains optimistic about the drug's potential, although the delay has raised concerns about the future approval process [7].