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StocksMedium•6 March 2026•

1 min read

Acadia Pharmaceuticals Faces Setback as EU Regulators Reject Rett Syndrome Drug

Key Facts

1The CHMP issued a negative opinion on Acadia Pharmaceuticals' drug trofinetide for Rett syndrome.

2Acadia Pharmaceuticals plans to request a re-examination of the decision by the EMA.

The Committee for Medicinal Products for Human Use (CHMP) has issued a negative opinion regarding Acadia Pharmaceuticals' drug, trofinetide, intended for the treatment of Rett syndrome. This regulatory rejection creates a significant barrier to the drug's entry into the European market, despite previously reported positive data from the company's Phase 3 LAVENDER clinical study. In response to the decision, Acadia Pharmaceuticals announced its plans to formally request a re-examination by the European Medicines Agency (EMA). The negative opinion introduces substantial uncertainty regarding the drug's approval timeline, potentially delaying a key revenue stream for the company. Consequently, the news has triggered bearish sentiment among investors as they weigh the impact of regulatory hurdles on Acadia's valuation. The company remains committed to the approval process, though the path forward in the European Union now faces increased complexity.