Independent directory Public ClinicalTrials.gov records United States
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ClinicalTrials.gov public records Last synced Oct 20, 2026, 11:34 PM EDT

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Showing 1–5 of 5 matching trials from the live ClinicalTrials.gov search.
Conditions
Narcolepsy
Interventions
MK-6552, Placebo
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
5
States / cities
Colorado Springs, Colorado • Brandon, Florida • Atlanta, Georgia + 2 more
Conditions
Healthy, Narcolepsy
Interventions
MK-6552, MK-6552 placebo, Modafinil, Modafinil placebo
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
2
States / cities
Atlanta, Georgia • Eatontown, New Jersey
Conditions
Healthy
Interventions
MK-6552, Diltiazem
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Lenexa, Kansas
Conditions
Healthy
Interventions
MK-6552
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
South Miami, Florida
Conditions
Healthy, Narcolepsy
Interventions
MK-6552, Modafinil
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years to 45 Years · Male only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Knoxville, Tennessee