Independent directory Public ClinicalTrials.gov records United States
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ClinicalTrials.gov public records Last synced Oct 8, 2026, 10:29 PM EDT

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Showing 1–6 of 6 matching trials from the live ClinicalTrials.gov search.
Conditions
Healthy
Interventions
Omeprazole, Gefapixant
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
18 Years to 55 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Tempe, Arizona
Conditions
Healthy
Interventions
Omeprazole, Gefapixant
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
18 Years to 55 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Tempe, Arizona
Completed Phase 2 Interventional Results available

An 8-Week Refractory Chronic Cough Study (MK-7264-021)

NCT02612623
Conditions
Refractory Chronic Cough
Interventions
Gefapixant, Placebo (for gefapixant)
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
18 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
10
States / cities
Mission Viejo, California • San Jose, California • Colorado Springs, Colorado + 7 more
Conditions
Osteoarthritis of the Knee
Interventions
Gefapixant, Sugar Pill
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
40 Years to 80 Years
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
34
States / cities
Phoenix, Arizona • San Diego, California • Clearwater, Florida + 29 more
Conditions
Idiopathic Pulmonary Fibrosis
Interventions
Gefapixant
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
40 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015
U.S. locations
1
States / cities
Charlotte, North Carolina
Conditions
Bladder Pain Syndrome
Interventions
Gefapixant, Placebo
Drug
Lead sponsor
Afferent Pharmaceuticals, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Industry
Eligibility
18 Years to 80 Years · Female only
Enrollment
107 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
41
States / cities
Glendale, Alabama • Homewood, Alabama • Mobile, Alabama + 37 more