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ART

Phase 3

HIV-1 Infection | Small molecule | Infectious Disease |Merck & Company, Inc.|Last Updated: Nov 21, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment553
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05631093A Switch to Doravirine/Islatravir (DOR/ISL) in Participants With Human Immunodeficiency Virus Type 1 (HIV-1) Who Are Virologically Suppressed on Antiretroviral Therapy (ART) (MK-8591A-051)PHASE3 ACTIVE NOT_RECRUITING 553Feb 20, 2023Jul 11, 2028Nov 21, 202553 United States, Australia +6
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Study Endpoints
Primary Endpoints
Percentage of Participants With HIV-1 RNA ≥50 Copies/mL at Week 48
Week 48

HIV-1 RNA levels in plasma were measured by polymerase chain reaction (PCR) assay with a reliable lower limit of quantification of \<50 copies/mL. The percentage of participants with HIV-1 RNA ≥50 copies/mL at Week 48 is presented using the FDA Snapshot missing data approach.

Percentage of Participants With One or More Adverse Events (AEs) at Week 48
Up to Week 48

An AE is defined as any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The percentage of participants who experienced at least one AE from Day 1 up to Week 48 are reported.

Percentage of Participants With an AE Leading to Discontinuation of Study Intervention at Week 48
Up to Week 48

An AE is defined as any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The percentage of participants who experienced at least one AE leading to discontinuation of study intervention from Day 1 up to Week 48 are reported.

Secondary Endpoints
Percentage of Participants With HIV-1 RNA <200 Copies/mL at Week 48
Week 48
Percentage of Participants With HIV-1 RNA <50 Copies/mL at Week 48
Week 48
Percentage of Participants With HIV-1 RNA <200 Copies/mL at Week 96
Week 96
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
DOR/ISLEXPERIMENTALParticipants with Human Immunodeficiency Virus-1 (HIV-1) that have been virologically suppressed for ≥3 consecutive months who were previously treated with continuous baseline antiretroviral therapy (ART) receive doravine/islatravir (DOR/ISL), a fixed dose combination (FDC) of 100 mg DOR/0.25 mg ISL orally once daily (qd) for 144 weeks. At Week 144, participants who consent to enter the optional study extension will continue to receive DOR/ISL qd (100 mg/0.25 mg) for an additional 96 weeks or until it is commercially accessible (whichever comes first).
ART + DOR/ISLACTIVE_COMPARATORParticipants with HIV-1 that has been virologically suppressed for ≥3 consecutive months who were previously treated with continuous baseline ART received standard of care (SOC) ART for 48 weeks, followed by treatment with DOR/ISL as a FDC of 100 mg DOR/0.25 mg ISL orally qd until Week 144. At Week 144, participants who consent to enter the optional study extension will continue to receive DOR/ISL qd (100 mg/0.25 mg) for an additional 96 weeks or until it is commercially accessible (whichever comes first).
Interventions
NameTypeDescription
ARTDRUGStandard of care ART, per approved product list, taken orally
DOR/ISLDRUGSingle tablet combination of 100 mg doravirine (DOR) with 0.25 mg Islatravir (ISL) in tablet form, taken orally, once daily.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites53

Inclusion Criteria: * Is Human Immunodeficiency Virus-1 (HIV-1) positive with plasma HIV-1 Ribonucleic Acid (RNA) \<50 copies/mL at screening * Has been receiving continuous, stable oral 2-drug or 3-drug combination (± PK booster) antiretroviral therapy ART with documented viral suppression (HIV-1 ...

Countries:United StatesAustraliaCanadaColombiaJapanSouth AfricaSwitzerlandUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05631093primaryCompletionDate: changed
LOWMay 24, 2026NCT05631093studyFirstPostDate: changed