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BELSOMRA — FDA Complete Response Letter (NDA 204569)

Issued to Merck & Co., Inc.. Application reviewed but not approved; deficiencies must be corrected.

Application

NDA 505b1 • 204569

Product

BELSOMRA

Company

Merck & Co., Inc.

Stage

Final Decision

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What did FDA decide for BELSOMRA?

Source facts and Assyro context are separated so you can scan the action quickly without treating analysis as an FDA conclusion.

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Source facts

FDA's complete response letter contains source-text evidence related to Labeling, packaging, and proprietary name, Safety and adverse events, Clinical efficacy and substantial evidence, Statistical analysis. Theme counts identify where the letter discusses a topic; they do not replace review of the exact redacted letter.

Key details in this letter

  • 1Labeling, packaging, and proprietary name: 7 source-text matches.
  • 2Safety and adverse events: 5 source-text matches.
  • 3Clinical efficacy and substantial evidence: 4 source-text matches.
  • 4Statistical analysis: 1 source-text match.
Labeling, packaging, and proprietary nameSafety and adverse eventsClinical efficacy and substantial evidenceStatistical analysis

Suggested next step

Review the exact redacted FDA letter and address each stated deficiency before resubmission.

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Built from structured FDA metadata and deterministic source-text signals. Topic matches are navigation aids, not legal or regulatory conclusions. Verify material decisions against the original FDA document.

FDAPDFUpdated Jul 30, 2026

FDA source document

Read the full FDA complete response letter (PDF)

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Common questions about the BELSOMRA complete response letter

What does this complete response letter mean for BELSOMRA?

Application reviewed but not approved; deficiencies must be corrected. Requires resubmission addressing deficiencies. FDA issued this letter to Merck & Co., Inc. on June 28, 2013.

What is NDA 204569?

NDA 204569 is the application under which FDA issued this complete response letter for BELSOMRA to Merck & Co., Inc.. The letter is dated June 28, 2013.

What happens after an FDA complete response letter?

FDA will not approve the application in its present form. The sponsor can resubmit after addressing every deficiency listed in the letter — which starts a Class 1 (two-month) or Class 2 (six-month) resubmission review clock — withdraw the application, or request an opportunity for a hearing.