Assyro AI
US FDAUnited StatesALApproval Letter

Approval Letter Other (Nov 13, 2025)

Issued November 13, 2025

Issued

November 13, 2025

Application

Other

Review center

Other

Stage

Final Decision

Letter type

Approval Letter

Response due November 13, 2026Product may be marketed.

Summary

The FDA issued a Complete Response letter for Ferring Pharmaceuticals Inc.'s New Drug Application (NDA 022517) for Nocdurna (desmopressin) Orally Disintegrating Tablets. The application cannot be approved in its current form due to insufficient evidence that the drug's effect on nocturnal voids is clinically meaningful and outweighs the risks of hyponatremia. The FDA recommends conducting a new clinical trial to demonstrate meaningful clinical benefit using patient-reported outcomes and to prospectively evaluate hyponatremia monitoring strategies. The letter also outlines requirements for updating prescribing information, resubmitting the proprietary name, and providing a comprehensive safety update, including data from all nonclinical and clinical studies.

Key points

  • Conduct a new clinical trial to demonstrate that Nocdurna provides a meaningful clinical benefit associated with the reduction in nocturnal voids in adults with nocturia due to nocturnal polyuria, employing efficacy endpoint(s) that measure patient benefit (e.g., a validated patient-reported outcome instrument).
  • Prospectively evaluate hyponatremia monitoring strategies in the new trial that are intended for mitigating the risk of hyponatremia in the postmarketing setting.
  • Include strategies for mitigating the risk of hyponatremia in the Complete Response that would ensure safe postmarketing use of Nocdurna in the intended population.
  • Review the labeling review resources on the PLR Requirements for Prescribing Information website, including regulations and related guidance documents and the Selected Requirements for Prescribing Information (SRPI) checklist, if revising labeling.
  • Include updated content of labeling (21 CFR 314.50(l)(1)(i)) in Structured Product Labeling (SPL) format if revising labeling.
  • Resubmit the proposed proprietary name, Nocdurna, when responding to the application deficiencies.
  • Include a safety update as described at 21 CFR 314.50(d)(5)(vi)(b) when responding to the deficiencies.
  • Describe in detail any significant changes or findings in the safety profile in the safety update.

Cited reasons

  • Insufficient Evidence of Clinically Meaningful Benefit and Unfavorable Risk-Benefit Profile
  • Prescribing Information Not Yet Reviewed
  • Proprietary Name Resubmission Required
  • Comprehensive Safety Update Required
  • The application for Nocdurna was not approved due to insufficient evidence of clinically meaningful benefit and an unfavorable risk-benefit profile, primarily concerning the risk of hyponatremia. A new clinical trial is required to demonstrate efficacy and evaluate risk mitigation strategies. Additionally, a comprehensive safety update and resubmission of the proprietary name are needed.

Recommended actions

  • Conduct a new clinical trial to demonstrate that Nocdurna provides a meaningful clinical benefit associated with the reduction in nocturnal voids in adults with nocturia due to nocturnal polyuria, employing efficacy endpoint(s) that measure patient benefit (e.g., a validated patient-reported outcome instrument).
  • Prospectively evaluate hyponatremia monitoring strategies in the new trial that are intended for mitigating the risk of hyponatremia in the postmarketing setting.
  • Include strategies for mitigating the risk of hyponatremia in the Complete Response that would ensure safe postmarketing use of Nocdurna in the intended population.
  • Review the labeling review resources on the PLR Requirements for Prescribing Information website, including regulations and related guidance documents and the Selected Requirements for Prescribing Information (SRPI) checklist, if revising labeling.
  • Include updated content of labeling (21 CFR 314.50(l)(1)(i)) in Structured Product Labeling (SPL) format if revising labeling.
  • Resubmit the proposed proprietary name, Nocdurna, when responding to the application deficiencies.
  • Include a safety update as described at 21 CFR 314.50(d)(5)(vi)(b) when responding to the deficiencies.
  • Describe in detail any significant changes or findings in the safety profile in the safety update.

Deficiency summary

The application for Nocdurna was not approved due to insufficient evidence of clinically meaningful benefit and an unfavorable risk-benefit profile, primarily concerning the risk of hyponatremia. A new clinical trial is required to demonstrate efficacy and evaluate risk mitigation strategies. Additionally, a comprehensive safety update and resubmission of the proprietary name are needed.

Findings

Insufficient Evidence of Clinically Meaningful Benefit and Unfavorable Risk-Benefit Profile

Severity: critical

The agency determined that there is insufficient evidence to conclude that the effect of Nocdurna relative to placebo on the number of nocturnal voids in adults with nocturia due to nocturnal polyuria is clinically meaningful and outweighs the risks of hyponatremia associated with the drug's use. This conclusion was reached after considering the submitted information and discussions at an advisory committee meeting.

Recommended response: Conduct a new clinical trial to demonstrate meaningful clinical benefit, employing validated patient-reported outcome instruments that capture the clinical impact of changes in nocturnal voids. Prospectively evaluate hyponatremia monitoring strategies for mitigating risk in the postmarketing setting. Include these strategies in the Complete Response.

Prescribing Information Not Yet Reviewed

Severity: minor

The agency reserves comment on the proposed labeling until the application is otherwise adequate. The sponsor is encouraged to review the PLR Requirements for Prescribing Information website, including regulations and related guidance documents, and the Selected Requirements for Prescribing Information (SRPI) checklist. Any revised labeling must conform to format items in regulations and guidances and include updated content of labeling in Structured Product Labeling (SPL) format.

Recommended response: Review PLR requirements, SRPI checklist, and relevant guidances. Revise labeling to conform to format items and submit updated content in SPL format once clinical deficiencies are addressed.

Cited: 21 CFR 314.50(l)(1)(i)

Proprietary Name Resubmission Required

Severity: info

The proposed proprietary name, Nocdurna, was found acceptable pending approval of the application in the current review cycle. It must be resubmitted when responding to the application deficiencies.

Recommended response: Resubmit the proposed proprietary name with the complete response to the application deficiencies.

Comprehensive Safety Update Required

Severity: major

A comprehensive safety update is required as described at 21 CFR 314.50(d)(5)(vi)(b). This includes detailing significant changes in the safety profile, incorporating new safety data from all nonclinical and clinical studies/trials (regardless of indication, dosage form, or dose level), presenting tabulations of new and combined data, comparing frequencies of adverse events, providing separate tables for other indications, retabulating reasons for premature discontinuation, providing case report forms and narrative summaries for deaths/serious adverse events, describing changes in common adverse events, providing updated exposure information, summarizing worldwide safety experience, and providing English translations of current approved foreign labeling.

Recommended response: Compile a comprehensive safety update including all new nonclinical and clinical data, adverse event frequencies, patient narratives for deaths/serious AEs, updated exposure, worldwide experience, and foreign labeling translations, as per 21 CFR 314.50(d)(5)(vi)(b).

Cited: 21 CFR 314.50(d)(5)(vi)(b)

Regulatory context

Submission stage
final decision
Regulatory pathway
NDA 505(b)

Impact

Impact score
0.95
Estimated delay
730 days
Estimated rework cost
$0
Subsequent action
resubmission

Strategic insights

The application was not approved due to a lack of demonstrated clinically meaningful benefit and unresolved safety concerns regarding hyponatremia, necessitating a new clinical trial and a thorough safety data update.

Regulatory change impact: Pending sponsor mitigation plan

Approval likelihood after response: 5%

Document viewer

Read the FDA letter and send context to the co-pilot at any time.

Loading document viewer…