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Xenon Pharmaceuticals stock plunges 27.6% after pausing clinical trials due to safety concerns.

Market News
18 Sep 2026
Gordon Thompson
View Source
Bearish
Xenon Pharmaceuticals stock plunges 27.6% after pausing clinical trials due to safety concerns.

Xenon Pharmaceuticals halted new patient enrollment in its psychiatry clinical trials for the drug azetukalner after reports of neuropsychiatric side effects. This pause led to a sharp 27.6% drop in its stock price, marking its worst day since 2017. Analyst Wedbush lowered the price target from $71 to $55, reflecting concerns about the drug's development. The company focuses on treatments for neurological and psychiatric disorders, and this setback raises uncertainty about its lead drug's future progress.

Xenon Pharmaceuticals saw a 27.6% stock price plunge amid trial pauses. For readers following health-sector stocks, here is Pluang's market snapshot as of Sep 18, 2026 20:41 WIB: out of 92 priced US health stocks, 35 rose and 55 fell. Notable movers include HIMS at USD 28.40 with a 1-day change of +1.83% and 100% buy order activity, ILMN at USD 240.83 down 1.78% with 0% sell orders, and INO at USD 1.23 up 1.65% with 84% buy orders and a typical hold time of 42 days.

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