Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.

NCT04568603 · ClinicalTrials.gov registry record · Phase 1

Islatravir and Methadone Pharmacokinetics (MK-8591-029)

A Phase 1 study of HIV-1-infection, sponsored by Merck Sharp & Dohme.

Completed
Registry status
Phase 1
Development phase
14
Enrollment target
2
Study locations

NCT04568603: Completed Phase 1 study of HIV-1-infection, sponsored by Merck Sharp & Dohme.

NCT04568603 is a Phase 1 study of HIV-1-infection that has completed, run by Merck Sharp & Dohme. The registered enrollment target is 14 participants, below the 351-participant average among 71 other HIV-1-infection trials with a reported enrollment target (96% lower). The trial reports 2 study locations across 2 states. According to ClinicalTrials.gov, the official US trial registry.

View on ClinicalTrials.gov ↗

View your shortlist →

The verdict

NCT04568603, a Phase 1 study of HIV-1-infection, has completed, sponsored by Merck Sharp & Dohme.

COMPLETED
Registry status
Phase 1
Development phase
14 participants
Enrollment target
2
Study locations

Study Summary

The present study is designed to determine the effect of islatravir (ISL) \[MK-8591\] on methadone pharmacokinetics (PK). The primary objective is to assess whether ISL impacts the area under the plasma concentration time curve from dosing to 24 hours postdose (AUC0-24) of S-methadone and R-methadone in participants on oral methadone therapy. It is hypothesized that the plasma AUC0-24hr for S- and R-methadone will be similar after methadone alone compared to methadone and ISL 60 mg coadministration.

Primary Outcome

The AUC0-24 of R-methadone was determined on Day 1 (methadone) and Day 2 (methadone + ISL). Back-transformed least-squares mean and confidence interval from mixed effects model were performed on natural log-transformed values; data show the geometric least squares mean.

Conditions Studied

Interventions

  • DRUG Islatravir

Study Locations (2)

Florida

  • Research Centers of America, LLC ( Site 0002) - Hollywood

Utah

  • PRA Health Sciences ( Site 0001) - Salt Lake City

Trial Details

FieldValue
Enrollment Target 14 participants
Start Date 2020-10-16
Est. Completion 2021-07-09
Phase Phase 1
Merck Sharp & Dohme

558 total trials

What the finished NCT04568603 record still lists

NCT04568603 is an interventional study that assigns participants to a tested intervention. The registry caps enrollment at 14 participants, a relatively small participant target, below the 351-participant average among 71 other HIV-1-infection trials with a reported enrollment target (96% lower).

The record links to 1 condition, with HIV-1-infection appearing as the primary indexed condition, and to 1 intervention - of which Islatravir is the first listed.

NCT04568603 reports a single indexed study location in Florida, Utah.

Frequently Asked Questions

What is clinical trial NCT04568603 about?

NCT04568603 is a clinical study titled "Islatravir and Methadone Pharmacokinetics (MK-8591-029)". The present study is designed to determine the effect of islatravir (ISL) \[MK-8591\] on methadone pharmacokinetics (PK). The primary objective is to assess whether ISL impacts the area under the plasma concentration time curve from dosing to 24 hours postdose (AUC0-24) of S-methadone and R-methadon...

What is the current status of trial NCT04568603?

This trial is currently completed. It is a Phase 1 study. The enrollment target is 14 participants. The study started on 2020-10-16. Estimated completion is 2021-07-09.

What conditions does trial NCT04568603 study?

This clinical trial studies the following conditions: HIV-1-infection.

What interventions are being tested in trial NCT04568603?

The interventions under investigation include: Islatravir (DRUG).

Who is sponsoring clinical trial NCT04568603?

This trial is sponsored by Merck Sharp & Dohme, which has 558 total clinical trials registered on ClinicalTrials.gov.

Where is trial NCT04568603 being conducted?

This trial has 2 study locations across Florida, Utah. Contact the study sites directly through ClinicalTrials.gov for enrollment availability.

Similar trials for HIV-1-infection

Matched on the same primary condition, ranked to surface studies in the same phase first, then by recruiting status, no relevance scoring or editorial curation.

Where NCT04568603's enrollment target sits among peer trials

14 67th of 71 higher than 5 of 71 other HIV-1-infection trials

participants (enrollment target), bucketed by value

Each bar is a band; taller bars hold more other HIV-1-infection trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source ClinicalTrials.gov registry export · 2026-08-08

Nationwide trials with similar profiles

Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.

Similar enrollment target

  • NCT02523092 · 14 participants · Phase 4

    Use of CXCL9 as a Biomarker of Acthar Efficacy

  • NCT04263285 · 14 participants · NA

    Treatment of Depression Post-SCI

  • NCT04743271 · 14 participants · NA

    Food and Circadian Timing

  • NCT05065671 · 14 participants · Phase 1

    Microbiome Derived Metabolism and Pharmacokinetics

Similar registry start date

  • NCT05962346 · started 2026-12 · NA

    Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia

  • NCT07125183 · started 2026-12 · Phase 2

    Study on Efficacy and Tolerability of Weekly Doxorubicin in Elderly Patients With Advanced or Metastatic Leiomyosarcoma

  • NCT07292298 · started 2026-11 · Phase 2

    Phase 2 Single-Arm Rectal Cancer Brachytherapy for Patients With Low-Lying Residual Adenocarcinoma After Total Neoadjuvant Therapy to Improve Organ Preservation Rates

  • NCT06358040 · started 2026-10 · NA

    Opioid Dispenser for Microdiscectomy/Laminectomy

Source: ClinicalTrials.gov NCT04568603, the US trial registry maintained by the National Library of Medicine. NCT04568603 (small enrollment · single site footprint · completed) retrieved and formatted by PlainTrial, see methodology.