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Fexinidazole

Phase 3

Trypanosomiasis, African | Small molecule | Other |Sanofi|Last Updated: Sep 19, 2025

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment174

FDA Designations

No designations recorded

Clinical trial landscape

Fexinidazole · 3 trials · 5 indications

Phase 3 1Phase 1 2
NCT03025789Fexinidazole in Human African Trypanosomiasis Due to T.b. Gambiense at Any StageTrypanosomiasis, African
COMPLETED174 Analytics
PHASE3COMPLETED
Fexinidazole in Human African Trypanosomiasis Due to T.b. Gambiense at Any Stage
Trypanosomiasis, AfricanUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants Whose Treatment Outcome at Month 18 is a Success
Between the first intake of fexinidazole (Day 1) and the end of the follow-up period (18 months)

Treatment outcome at Month 18 is categorized as success or failure. Success is defined as a cure, according to the criteria adapted from the World Health Organization (WHO) update of the methodological framework for clinical trials in Sept 2014 (WHO/HTM/NTD/IDM/2015.5). Failure is defined as a relapse, probable relapse, death, use of rescue medication, loss to follow-up, refusal of all post-treatment lumbar puncture, and, in the absence of lumbar puncture at the Month 18 visit, an unfavorable outcome earlier than Month 18, or signs and symptoms evoking a relapse at Month 18. Success rate at Month 18 is defined as the percentage of participants (regardless of g-HAT stage) whose treatment outcome is a success at Month 18. An estimate of the success rate at Month 18 and the 95% exact Clopper-Pearson confidence interval (CI) of the estimate are provided.

Cmax for fexinidazole and metabolites M1, M2
Day 1 to Day 6

Maximum plasma concentration observed (Cmax)

AUC for fexinidazole and metabolites M1, M2
Day 1 to Day 6

Area under the plasma concentration versus time curve extrapolated to infinity (AUC)

Plasma concentration measurement of fexinidazole, fexinidazole sulfoxide and sulfone metabolites after a single oral dose of fexinidazole (1200mg) administration and under different food intake conditions

Secondary Endpoints

Percentage of Participants Whose Treatment Outcome at Month 12 is a Success
Between the first intake of fexinidazole (Day 1) and the end of the follow-up period (18 months)
Number of Participants With Any Grade ≥ 3 Treatment-emergent Adverse Events (AEs) Including Laboratory and Hematological Abnormalities (if Considered Clinically Significant)
Between the first intake of fexinidazole (Day 1) and the end of the observation period, or the end of the follow-up period (18 months) for non-serious AEs assessed as related to fexinidazole
Number of Participants With Any Treatment-emergent Serious Adverse Event (SAE)
Between the first intake of fexinidazole (Day 1) and the end of the follow-up period (18 months)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
InpatientsEXPERIMENTALParticipants received fexinidazole orally for 10 days as inpatients (at the hospital)
OutpatientsEXPERIMENTALParticipants received fexinidazole orally for 10 days as outpatients (at home)
Participants with mild HIEXPERIMENTALMild HI is defined as a total score ranging from 5 to 6, inclusive (Child-Pugh score A)
Participants with moderate HIEXPERIMENTALModerate HI is defined as a total score ranging from 7 to 9, inclusive (Child-Pugh score B)
Participants with normal hepatic functionEXPERIMENTALParticipants with normal hepatic function matched to participants
FastingEXPERIMENTALTreatment A: 1200mg fexinidazole administered in fasting conditions by oral route
Meal 1: Plumpy NutsEXPERIMENTALTreatment B: 1200mg fexinidazole administered in fed conditions (meal 1) by oral route
Meal 2: Rice + beansEXPERIMENTALTreatment B: 1200mg fexinidazole administered in fed conditions (meal 2) by oral route

Interventions

NameTypeDescription
FexinidazoleDRUGTablets of 600 mg; Participants with a weight between 20 and 34 kg received 1200 mg (2 tablets) for 4 days, then 600 mg (1 tablet) for 6 days (with food); Participants with a weight of 35 kg and above received 1800 mg (3 tablets) for 4 days, then 1200 mg (2 tablets) for 6 days (with food)
Fexinidazole (HOE239)DRUGRoute of administration: oral; pharmaceutical form: tablet
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Eligibility Criteria

Age Range6 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites8

Inclusion Criteria: * Male or female patient, including breastfeeding or pregnant women in the second or third trimester. * ≥ 6 years of age. * ≥ 20 kg body weight. * Signed Informed Consent Form and Assent Form for patients less than 18 years of age * Trypanosomes detected in any body fluid. * Phy...

Countries:Democratic Republic of the CongoGuineaBulgariaFrance
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Frequently asked questions about Fexinidazole

What is Fexinidazole used for?

Fexinidazole is an investigational small molecule being studied for Human African Trypanosomiasis, also known as sleeping sickness, caused by T.b. gambiense. It has been evaluated in a Phase 3 clinical trial for this condition. It is also being studied in healthy volunteers for pharmacokinetic purposes and in participants with hepatic impairment.

Who makes Fexinidazole?

Fexinidazole is being developed by Sanofi, a biopharmaceutical company traded on the stock exchange under the ticker SNY. Sanofi has sponsored clinical trials of Fexinidazole across multiple countries, including France, the Democratic Republic of the Congo, Guinea, and Bulgaria.

What phase is Fexinidazole in?

Fexinidazole has completed a Phase 3 clinical trial for Human African Trypanosomiasis due to T.b. gambiense, as well as Phase 1 trials for pharmacokinetic and hepatic impairment studies. It remains an investigational drug and is not approved for any use.

What clinical trials is Fexinidazole in?

Fexinidazole has been studied in three completed clinical trials. NCT01340157 was a Phase 1 bioavailability study in healthy volunteers in France. NCT03025789 was a Phase 3 trial in patients with Human African Trypanosomiasis in the Democratic Republic of the Congo and Guinea. NCT05607173 was a Phase 1 pharmacokinetic study in participants with hepatic impairment.

Is Fexinidazole the same as fexinidazole?

Fexinidazole is the drug name used consistently across all clinical trials and publications. No alternative names have been established for this compound in the available clinical trial records.