2nd CRL for Merck’s Gefapixant Chronic Cough Drug

Share

FDA has issued a complete response letter saying that Merck’s NDA resubmission for gefapixant, an investigational, non-narcotic, oral selective P2X3 receptor antagonist, did not meet substantial evidence of effectiveness for treating refractory chronic cough and unexplained chronic cough. A company statement says the letter was not related to gefapixant safety.

An earlier NDA was issued an FDA complete response letter in 1/2022. The resubmission included additional analyses and information related to the cough counting system that was used to assess efficacy. The company says it is reviewing the agency’s feedback to determine the next steps.

Late last year, FDA’s Pulmonary-Allergy Drugs Advisory Committee voted 12 to 1 that the evidence does not demonstrate that gefapixant provides a clinically meaningful benefit. The panel was convened after agency reviewers concluded that making an assessment on the clinical meaning of “complicated” data presentations in the Merck NDA resubmission for chronic cough medicine gefapixant is a challenge and expert input was needed (see earlier story).

Read more