Idorsia's clazosentan failure sends shares tumbling

6 February 2023

Swiss pharma company Idorsia (SIX: IDIA) was trading 10% lower at lunchtime on Monday.

Idorsia earlier announced initial results from REACT, a Phase III study investigating the efficacy and safety of clazosentan in preventing clinical deterioration due to delayed cerebral ischemia, in patients following aneurysmal subarachnoid hemorrhage (aSAH).

The study did not meet its primary endpoint. Idorsia will now analyze the efficacy and safety data to understand what was an unexpected result.

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