RespiratoryMerck

Merck Reports Phase 3 Results for Gefapixant in Refractory Chronic Cough

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Biotechnology Media Insights

Editorial Team · July 28, 2025

Merck announces Phase 3 COUGH-1 and COUGH-2 trial results showing gefapixant significantly reduces cough frequency in patients with refractory or unexplained chronic cough.

Respiratory disease research with pharmaceutical drug development laboratory

Merck today announced results from the Phase 3 COUGH-1 and COUGH-2 trials evaluating gefapixant in patients with refractory or unexplained chronic cough. Both trials demonstrated significant reductions in 24-hour cough frequency compared to placebo at week 12.

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