The Pharmacokinetics of Gefapixant (MK-7264) in Participants With Renal Insufficiency (MK-7264-026)

Inclusion Criteria

• Is a non-smoker or moderate smoker (≤ 20 cigarettes/day or the equivalent) who agrees to consume no more than 10 cigarettes or equivalent/day from the time of screening and throughout the period of sample collection.
• Has a body mass index (BMI) ≥ 18.5 and ≤ 40.0 kg/m^2,
• Is judged to be in good health based on medical history, physical examination, vital signs, and laboratory safety tests. Has no clinically significant electrocardiogram (ECG) abnormality, as deemed by the Investigator.
• Females are non-pregnant, and non-breast feeding. If female with reproductive potential, they must demonstrate they are not pregnant and agree to use (and/or have their partner use) two (2) acceptable methods of birth control beginning at screening, throughout the study and until 2 weeks after dosing of study drug.
• Participants with ESRD requiring HD has been maintained on stable regimen of thrice-weekly HD for at least 3 months prior to first dosing.
• Healthy participants, must be within ± 10 years of the mean age of participants with RI; and must be within ± 10 kg of the mean weight of participants with RI.

Exclusion Criteria

• Is mentally or legally incapacitated or has significant emotional problems at the time of the screening visit, or expected during the conduct of the study.
• Has a history or presence of clinically significant medical or psychiatric condition or disease.
• Has a history of any illness that, in the opinion of the Investigator, might confound the results of the study or poses an additional risk by participating in the study.
• Has a history or presence of alcoholism or drug abuse within the past 6 months prior to dosing.
• Has a history or presence of hypersensitivity or idiosyncratic reaction to the study drug or related compounds (including sulfonamides).
• Has a history or presence of renal artery stenosis; or major risk factors for renal/urinary calculi.
• Has rapidly fluctuating renal function as determined by historical measurements.
• Female who is pregnant, or lactating.
• Has positive results for urine or saliva drug and/or urine or breath alcohol at screening or check-in.
• Is positive at screening for human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg), or hepatitis C virus (HCV).
• Has positive macroscopic hematuria or crystalluria at screening or check-in.
• Is unable to refrain from or anticipates using any medication or substance including prescription or over-the-counter, vitamin supplements, natural or herbal supplements.
• Has been on a diet incompatible with the on-study diet, within the 28 days prior to dosing.
• Has donated blood or had significant blood loss within 56 days prior to dosing.
• Has donated plasma within 7 days prior to dosing.
• Has taken gefapixant at any time prior to dosing on the current study.
• Has participated in another clinical trial within 28 days prior to dosing based on the latest blood collection or dosing.