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ApprovalH2 2026a window, not a day

European Commission decision on trofinetide (DAYBUE) in Rett syndrome

ACADIA expects European regulators to decide on DAYBUE (trofinetide) for Rett syndrome (adults and children 5 years and older) — EU in the second half of 2026 (no exact date yet). An approval lets the company start selling it in that market.

Plain-English summary generated from this entry’s own fields (drug, condition, stage, date). Glossary

DetailsRegulatory approval
Company
ACADIA Pharmaceuticals Inc. ACAD
Drug
DAYBUE (trofinetide)
For
Rett syndrome (adults and children 5 years and older) — EU
Stage
CHMP positive opinion adopted; EC decision pending
When
H2 2026 · the company gave a window, not a day; the calendar never invents one
Source note
Acadia's Q2 2026 earnings release states CHMP adopted a positive opinion recommending EU marketing authorization; the European Commission decision typically follows within about two months (timing inferred, not company-stated).
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ACADIA Pharmaceuticals Inc.
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Drug
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For
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Stage
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When
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Source note
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Plain-English summary generated from this entry’s own fields (drug, condition, stage, date). Glossary · Open this catalyst’s page

Trial resultsACADACADIAH2 2026

ACADIA expects to report results from its Phase 3 study of trofinetide (DAYBUE) for Rett syndrome (Japan) in the second half of 2026 (no exact date yet). Phase 3 is the last stage before a drug can be approved, so this result usually decides the program’s future.

More details
Entry
Trofinetide Japan Ph3 Rett syndrome topline (Oct 2026–Mar 2027 window) · Clinical trial results (readout / topline data)
Drug
trofinetide (DAYBUE)
For
Rett syndrome (Japan)
Stage
Phase 3 · the last stage before a drug can be approved
When
H2 2026 · the company gave a window, not a day
Source note
Guidance from Acadia's JPM 2026 update (Jan 13, 2026); not re-stated in the Q2 2026 release. Company window runs October 2026 through March 2027, so the date field is set to 2026-H2 only as the earliest half of that window.
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Plain-English summary generated from this entry’s own fields (drug, condition, stage, date). Glossary · Open this catalyst’s page