Pharmacokinetics of Islatravir in Participants With Severe Renal Impairment (MK-8591-026)

This study will evaluate the general tolerability and pharmacokinetics (PK) of a single 60 mg dose of MK-8591 (Islatravir) in participants with severe renal insufficiency, compared to participants in good health.


Eligibility Criteria:
Inclusion Criteria:

Healthy participants must have the following:

* Is in good health
* Has a body mass index (BMI) ≥18.5 and ≤40 kg/m2.
* Female is not pregnant or breastfeeding, and is not one of the following: a woman of childbearing potential (WOCBP); if a WOCBP, is using an acceptable contraceptive method, or is abstinent from heterosexual intercourse as their preferred and usual lifestyle; a WOCBP must have a negative highly sensitive pregnancy test within 24 hours before the first dose of study intervention

Renally impaired participants must have the following:

* With the exception of renal impairment, is in generally good health
* Has a BMI ≥ 18.5 and ≤ 40 kg/m2
* Female is not pregnant or breastfeeding, and is not one of the following: a woman of childbearing potential (WOCBP); if a WOCBP, is using an acceptable contraceptive method, or is abstinent from heterosexual intercourse as their preferred and usual lifestyle; a WOCBP must have a negative highly sensitive pregnancy test within 24 hours before the first dose of study intervention

Exclusion Criteria:

Healthy participants must have the following:

* Has a history of clinically significant endocrine, gastrointestinal, cardiovascular, hematological, hepatic, immunological, renal, respiratory, genitourinary, or major neurological (including stroke and chronic seizures) abnormalities or diseases.
* Is mentally or legally incapacitated, has significant emotional problems
* Has known hypersensitivity to the active substance or any of the excipients of the study drug
* Has a history of significant multiple and/or severe allergies (e.g. food, drug, latex allergy), or has had an anaphylactic reaction or significant intolerability (i.e. systemic allergic reaction) to prescription or non-prescription drugs or food.
* Is positive for hepatitis B surface antigen, hepatitis C antibodies or HIV.
* Had major surgery, donated or lost 1 unit of blood (approximately 500 mL) within prior 4 weeks
* Is taking medications to treat chronic medical conditions and/or conditions associated with renal disease
* Has participated in another investigational study within prior 4 weeks

Other exclusions for healthy participants:

* Does not agree to follow the smoking restrictions
* Consumes greater than 1 glass for women, or 2 glasses for men of alcoholic beverages per day
* Consumes excessive amounts,of caffeinated beverages per day.
* Is a regular user of cannabis, any illicit drugs or has a history of drug (including alcohol) abuse within approximately prior 3 months.

Renally impaired participants must have the following:

* Has a history or presence of renal artery stenosis.
* Has had a renal transplant or nephrectomy.
* Has rapidly fluctuating renal function as determined by historical measurements.
* Has known hypersensitivity to the active substance or any of the excipients of the study drug.
* Has a history of cancer (malignancy).
* Has a history of significant multiple and/or severe allergies (e.g. food, drug, latex allergy), or has had an anaphylactic reaction or significant intolerability (i.e. systemic allergic reaction) to prescription or non-prescription drugs or food.
* Is positive for hepatitis B surface antigen, hepatitis C antibodies or human immunodeficiency virus (HIV).
* Had major surgery, donated or lost 1 unit of blood (approximately 500 mL) within 4 weeks prior to the prestudy (screening) visit.
* Is taking medications to treat chronic medical conditions and/or conditions associated with renal disease and has not been on a stable regimen for at least 1 month and/or is unable to withhold the use of the medication(s) within 4 hours prior to and 8 hours after administration of the study drug.
* Has participated in another investigational study within 4 weeks (or 5 half-lives, whichever is greater) prior to the prestudy (screening) visit.

Other exclusions for renally impaired participants

* Does not agree to follow the smoking restrictions.
* Consumes greater than 1 glass for women, or 2 glasses for men of alcoholic beverages per day.
* Consumes excessive amounts of caffeinated beverages per day.
* Is a regular user of cannabis, any illicit drugs or has a history of drug (including alcohol) abuse within approximately 3 months.