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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

This document is a Complete Response letter from the FDA to Gilead Sciences, Inc. regarding their New Drug Applications (NDAs) for lenacapavir injection (NDA 215973) and lenacapavir tablet (NDA 215974). The FDA has determined that the applications cannot be approved in their current form due to various deficiencies related to product quality, prescribing information, proprietary name, and safety updates. The letter outlines specific issues and provides recommendations for addressing them.

Key points

  • Provide a comprehensive study report with unambiguous data and fully validated methods to demonstrate the compatibility of the drug product solution with the proposed primary container closure system (aluminosilicate glass vials) for lenacapavir injection.
  • Provide spectrophotometric data with all results from the Container Closure Integrity Testing (CCIT) dye ingress studies for specific batches (GB2007B, GB2008B, and GB2009B) of lenacapavir injection.
  • Provide details of the CCIT protocol used for lenacapavir injection, including the date the study was performed, confirmation that the dye ingress CCIT was conducted using units exposed to worst-case conditions, and confirmation that both pressure and vacuum conditions were applied during CCIT.
  • If worst-case conditions and both pressure and vacuum were not applied during CCIT for lenacapavir injection, provide a new CCIT.
  • Review labeling review resources (Prescription Drug Labeling Resources, Pregnancy and Lactation Labeling Final Rule, Selected Requirements for Prescribing Information (SRPI) checklist) for both NDAs.
  • If labeling is revised for either NDA, use the SRPI checklist to ensure conformity with format items in regulations and guidances.
  • Include updated content of labeling [21 CFR 314.50(l)(1)(i)] in structured product labeling (SPL) format for both NDAs.
  • Resubmit the proposed proprietary name (Sunlenca) when responding to the application deficiencies for both NDAs.

Cited reasons

  • Incompatibility of drug product with proposed vials and incomplete data for alternative vials
  • Incomplete Container Closure Integrity Testing (CCIT) data for aluminosilicate vials
  • Labeling comments reserved pending application adequacy
  • Resubmit proposed proprietary name with application deficiencies
  • Comprehensive safety update required
  • Approval of lenacapavir tablet contingent on lenacapavir injection approval
  • The FDA issued a Complete Response Letter for lenacapavir injection (NDA 215973) and lenacapavir tablet (NDA 215974). The primary issues for the injection relate to significant product quality concerns, specifically the incompatibility of the drug product solution with proposed commercial borosilicate glass vials and incomplete/ambiguous data for alternative aluminosilicate glass vials, including Container Closure Integrity Testing (CCIT). The approval of the lenacapavir tablet is contingent upon the resolution of the injection's deficiencies. Additionally, labeling comments are reserved, the proprietary name needs resubmission, and a comprehensive safety update is required.

Recommended actions

  • Provide a comprehensive study report with unambiguous data and fully validated methods to demonstrate the compatibility of the drug product solution with the proposed primary container closure system (aluminosilicate glass vials) for lenacapavir injection.
  • Provide spectrophotometric data with all results from the Container Closure Integrity Testing (CCIT) dye ingress studies for specific batches (GB2007B, GB2008B, and GB2009B) of lenacapavir injection.
  • Provide details of the CCIT protocol used for lenacapavir injection, including the date the study was performed, confirmation that the dye ingress CCIT was conducted using units exposed to worst-case conditions, and confirmation that both pressure and vacuum conditions were applied during CCIT.
  • If worst-case conditions and both pressure and vacuum were not applied during CCIT for lenacapavir injection, provide a new CCIT.
  • Review labeling review resources (Prescription Drug Labeling Resources, Pregnancy and Lactation Labeling Final Rule, Selected Requirements for Prescribing Information (SRPI) checklist) for both NDAs.
  • If labeling is revised for either NDA, use the SRPI checklist to ensure conformity with format items in regulations and guidances.
  • Include updated content of labeling [21 CFR 314.50(l)(1)(i)] in structured product labeling (SPL) format for both NDAs.
  • Resubmit the proposed proprietary name (Sunlenca) when responding to the application deficiencies for both NDAs.

Deficiency summary

The FDA issued a Complete Response Letter for lenacapavir injection (NDA 215973) and lenacapavir tablet (NDA 215974). The primary issues for the injection relate to significant product quality concerns, specifically the incompatibility of the drug product solution with proposed commercial borosilicate glass vials and incomplete/ambiguous data for alternative aluminosilicate glass vials, including Container Closure Integrity Testing (CCIT). The approval of the lenacapavir tablet is contingent upon the resolution of the injection's deficiencies. Additionally, labeling comments are reserved, the proprietary name needs resubmission, and a comprehensive safety update is required.

Findings

Incompatibility of drug product with proposed vials and incomplete data for alternative vials

Severity: critical

The drug product solution is incompatible with the proposed commercial borosilicate glass vials. Data provided for alternative aluminosilicate glass vials are incomplete and ambiguous, with glass particles found in clinical batches. A comprehensive study report with unambiguous data and fully validated methods is required to demonstrate compatibility with the proposed primary container closure system.

Recommended response: Conduct comprehensive compatibility studies with unambiguous data and fully validated methods for the proposed primary container closure system.

Incomplete Container Closure Integrity Testing (CCIT) data for aluminosilicate vials

Severity: major

The information request response regarding CCIT performed with aluminosilicate vials (batches GB2007B, GB2008B, GB2009B) is incomplete. Additional information is needed, including spectrophotometric data from dye ingress studies, details of the CCIT protocol, confirmation of worst-case condition exposure, and confirmation of pressure and vacuum conditions during testing. A new CCIT may be required if these conditions were not met.

Recommended response: Provide complete spectrophotometric data for CCIT dye ingress studies, detailed CCIT protocol, and confirm worst-case condition exposure and pressure/vacuum application during testing, or conduct a new CCIT.

Labeling comments reserved pending application adequacy

Severity: minor

Comments on the proposed labeling are reserved until the application is otherwise adequate. The sponsor is encouraged to review labeling review resources, regulations, and guidance documents, including the Selected Requirements for Prescribing Information (SRPI) checklist. An updated content of labeling in structured product labeling (SPL) format is required with the resubmission.

Recommended response: Review labeling resources and guidance, use the SRPI checklist, and submit updated content of labeling in SPL format with the resubmission.

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

Resubmit proposed proprietary name with application deficiencies

Severity: info

The proposed proprietary name, Sunlenca, was found acceptable pending approval of the application. It needs to be resubmitted when responding to the application deficiencies.

Recommended response: Resubmit the proposed proprietary name (Sunlenca) as part of the complete response.

Comprehensive safety update required

Severity: major

A comprehensive safety update, as described at 21 CFR 314.50(d)(5)(vi)(b), is required with the response to deficiencies. This includes data from all nonclinical and clinical studies, significant changes in safety profile, new safety data tabulations, comparisons, case reports for deaths/SAEs, updated exposure information, and worldwide experience.

Recommended response: Prepare a comprehensive safety update including all nonclinical and clinical data, significant changes, new safety data tabulations, comparisons, case reports for deaths/SAEs, updated exposure information, and worldwide experience, as per 21 CFR 314.50(d)(5)(vi)(b).

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

Approval of lenacapavir tablet contingent on lenacapavir injection approval

Severity: critical

Deficiencies in the product quality information for lenacapavir injection (NDA 215973) must be adequately addressed before the lenacapavir tablet application (NDA 215974) can be approved. A letter of authorization identifying the date of the Complete Response submission for NDA 215973 is required.

Recommended response: Address all deficiencies for lenacapavir injection (NDA 215973) and submit a letter of authorization for the tablet NDA (215974) confirming the injection's complete response submission date.

Regulatory context

Submission stage
final decision
Regulatory pathway
NDA 505(b)

Impact

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

Strategic insights

The primary theme is significant product quality issues related to container closure system compatibility and integrity for the injection formulation, which directly impacts the approvability of both the injection and the tablet. Other themes include standard requirements for labeling updates and a comprehensive safety update upon resubmission.

Regulatory change impact: Pending sponsor mitigation plan

Approval likelihood after response: 5%

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