A Study to Assess the Efficacy of Gefapixant (AF-219/MK-7264), a P2X3 Receptor Antagonist, in Subjects With Chronic Cough
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This is a randomised, double-blind, placebo-controlled, crossover, single centre study of gefapixant (AF-219/MK-7264) in subjects with idiopathic chronic cough designed to evaluate the effectiveness of gefapixant in reducing daytime objective cough frequency.
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Ages Eligible for Study:
18 Years to 70 Years (Adult, Older Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
History of cough for more than 8 weeks
Normal chest radiograph
Idiopathic or treatment resistant cough (idiopathic defined as a cough for which no objective evidence of an underlying trigger can be determined after investigation or a cough that is unresponsive to 8 weeks of targeted treatment for identified underlying triggers including reflux disease, asthma and post-nasal drip [treatment-resistant]).
Individuals who have given up smoking within the past 6 months, or those with >20 pack-year smoking history
Treatment with an ACE-inhibitor as the potential cause of a subject's cough, or requiring treatment with an ACE-inhibitor during the study or within 4 weeks prior to Day 0