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naloxone HCl, 4 mg, nasal spray — FDA Complete Response Letter (NDA 219045)

Issued to Hikma Pharmaceuticals USA Inc.. Application reviewed but not approved; deficiencies must be corrected.

Application

NDA 505b1 • 219045

Product

naloxone HCl, 4 mg, nasal spray

Company

Hikma Pharmaceuticals USA Inc.

Review center

CDER

Stage

Final Decision

Response due

October 21, 2025

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What did FDA decide for naloxone HCl, 4 mg, nasal spray?

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 Safety and adverse events, Labeling, packaging, and proprietary name, Clinical efficacy and substantial evidence, Bioequivalence and pharmacokinetics. Theme counts identify where the letter discusses a topic; they do not replace review of the exact redacted letter.

Key details in this letter

  • 1Safety and adverse events: 22 source-text matches.
  • 2Labeling, packaging, and proprietary name: 8 source-text matches.
  • 3Clinical efficacy and substantial evidence: 5 source-text matches.
  • 4Bioequivalence and pharmacokinetics: 3 source-text matches.
Safety and adverse eventsLabeling, packaging, and proprietary nameClinical efficacy and substantial evidenceBioequivalence and pharmacokineticsDevice constituent and human factors

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 naloxone HCl, 4 mg, nasal spray complete response letter

What does this complete response letter mean for naloxone HCl, 4 mg, nasal spray?

Application reviewed but not approved; deficiencies must be corrected. Requires resubmission addressing deficiencies. FDA issued this letter to Hikma Pharmaceuticals USA Inc. on October 21, 2024.

What is NDA 219045?

NDA 219045 is the application under which FDA issued this complete response letter for naloxone HCl, 4 mg, nasal spray to Hikma Pharmaceuticals USA Inc.. It was reviewed by FDA CDER. The letter is dated October 21, 2024.

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.