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M5717

Phase 2

Malaria Infection | Small molecule | Infectious Disease |Merck & Company, Inc.|Last Updated: Feb 6, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLED
Total Trials1
Total Enrollment192

FDA Designations

No designations recorded

Clinical trial landscape

M5717 · 1 trial · 1 indication

Phase 2 1
NCT05974267Efficacy, Safety, and PK of M5717 in Combination With Pyronaridine as Chemoprevention in Adults and Adolescents With Asymptomatic Plasmodium Falciparum Infection (CAPTURE-2)Malaria Infection
COMPLETED192 Analytics
PHASE2COMPLETED
Efficacy, Safety, and PK of M5717 in Combination With Pyronaridine as Chemoprevention in Adults and Adolescents With Asymptomatic Plasmodium Falciparum Infection (CAPTURE-2)
Malaria InfectionUnlock trial analytics

Study Endpoints

Primary Endpoints

Time to Parasitemia Since Negative Blood Smear After Treatment
From treatment Day 1 up to End of observation period Day 64 (Week 10)

The time (in days) to first recorded parasitemia (parasite count \>0) since the first negative blood smear (parasite count of 0) after treatment (followed at least by 1 subsequent visit with a negative blood film), i.e. the time without a positive blood smear. Median time and 95% CI was estimated using the Kaplan Meier method for each cohort.

Secondary Endpoints

Percentage of Participants With Parasitemia (Positive Blood Smear)
From treatment Day 1 up to End of observation period Day 64 (Week 10)
Percentage of Participants With Polymerase Chain Reaction (PCR)-Adjusted Parasitemia (Due to New Infections)
From treatment Day 1 up to End of observation period Day 64 (Week 10)
Percentage of Participants With PCR-adjusted Parasitemia (Due to Recrudescence)
From treatment Day 1 up to End of observation period Day 64 (Week 10)
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: M5717 (60 mg) + PyronaridineEXPERIMENTALParticipants received single oral dose of M5717 60 milligram (mg) plus pyronaridine tetraphosphate (pyronaridine) 720 mg (Participants \>= 65 kilogram \[kg\]) or pyronaridine 540 mg (Participants \>= 45 to \< 65 kg) once daily in a single day treatment regimen.
Cohort 2: M5717 (200 mg) + PyronaridineEXPERIMENTALParticipants received single oral dose of M5717 200 mg plus pyronaridine 720 mg (Participants \>= 65 kg) or pyronaridine 540 mg (Participants \>= 45 to \< 65 kg) once daily in a single day treatment regimen.
Cohort 3: M5717 (660 mg)+ PyronaridineEXPERIMENTALParticipants received single oral dose of M5717 660 mg plus pyronaridine 720 mg (Participants \>= 65 kg) or pyronaridine 540 mg (Participants \>= 45 to \< 65 kg) once daily in a single day treatment regimen.
Cohort 4: Atovaquone-proguanilEXPERIMENTALParticipants received orally 3 doses of Malarone (fixed-dose combination of atovaquone-proguanil) once daily in a 3-day treatment regimen.

Interventions

NameTypeDescription
M5717 60 mgDRUGParticipants received single oral dose (Capsules) of 60 mg M5717 on Day 1 under fasting condition
PyronaridineDRUGParticipants received Pyronaridine tablets orally single dose of 720 (Participants \>= 65 kg) and 540 mg (Participants \>= 45 to \< 65 kg) on Study Day 1 under fasting condition
Atovaquone-ProguanilDRUGParticipants received Atovaquone-Proguanil tablets 1000/400 mg once daily in a 3-day treatment regimen.
M5717 200 mgDRUGParticipants received single oral dose (Capsules) of 200 mg M5717 on Day 1 under fasting condition
M5717 660mgDRUGParticipants received single oral dose (Capsules) of 660 mg M5717 on Day 1 under fasting condition
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Eligibility Criteria

Age Range12 Years to 55 Years
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Participants with Asymptomatic Plasmodium falciparum Malaria with no Fever or other sign of Acute Uncomplicated Malaria and, with Microscopic confirmation using Giemsa-stained thick film, and a Parasitemia of \>= 40 to \<= 10,000 Asexual Parasites/Microliter (μL) of Blood. * A...

Countries:Burkina FasoKenyaThe GambiaZambia
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Frequently asked questions about M5717

What is M5717 used for?

M5717 is an investigational small molecule being developed for malaria infection. It is being studied as a chemoprevention treatment in combination with pyronaridine for adults and adolescents with asymptomatic Plasmodium falciparum infection. The drug is currently in Phase 2 clinical development.

Who makes M5717?

M5717 is being developed by Merck & Company, Inc., which trades under the ticker MRK. The company is conducting clinical trials to evaluate the drug's efficacy, safety, and pharmacokinetics in combination with pyronaridine for malaria chemoprevention.

What phase is M5717 in?

M5717 is in Phase 2 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The drug is being studied for its potential use in preventing malaria infection in specific patient populations.

What clinical trials is M5717 in?

M5717 has been studied in one completed Phase 2 clinical trial, identified as NCT05974267. This trial, called CAPTURE-2, evaluated the efficacy, safety, and pharmacokinetics of M5717 in combination with pyronaridine as chemoprevention in adults and adolescents with asymptomatic Plasmodium falciparum infection.

Is M5717 the same as pyronaridine?

No, M5717 is not the same as pyronaridine. M5717 is the investigational drug being developed by Merck & Company, Inc., while pyronaridine is a separate antimalarial agent used in combination with M5717 in clinical trials. The combination is being studied for malaria chemoprevention.