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Tafenoquine

Phase 2

Babesiosis | Small molecule | Infectious Disease |60 Degrees Pharmaceuticals, Inc.|Last Updated: Apr 17, 2026

Target and mechanism

ModalitySmall molecule

Also known as Tafenoquine 100mg

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment33

FDA Designations

ORPHAN_DRUG

Clinical trial landscape

Tafenoquine · 4 trials · 4 indications

Phase 2 4
NCT06656351B-FREE Chronic Babesiosis StudyChronic Babesiosis
RECRUITING40 Analytics
NCT06207370Oral Tafenoquine Plus Standard of Care Versus Placebo Plus Standard of Care for BabesiosisBabesiosis
RECRUITING33 Analytics
NCT04533347Tafenoquine in Patients With Mild to Moderate COVID-19COVID 19 Disease
COMPLETED86 Analytics
NCT03320174Long-Term Safety Study of TafenoquineHealthy Volunteers
COMPLETED600 Analytics
PHASE2RECRUITING
B-FREE Chronic Babesiosis Study
Chronic BabesiosisUnlock trial analytics
PHASE2RECRUITING
Oral Tafenoquine Plus Standard of Care Versus Placebo Plus Standard of Care for Babesiosis
BabesiosisUnlock trial analytics
PHASE2COMPLETED
Tafenoquine in Patients With Mild to Moderate COVID-19
COVID 19 DiseaseUnlock trial analytics
PHASE2COMPLETED
Long-Term Safety Study of Tafenoquine
Healthy VolunteersUnlock trial analytics

Study Endpoints

Primary Endpoints

Change in General Fatigue
From enrollment until Day 90 of treatment.

The Multidimensional Fatigue Inventory (MFI) is a 20-item, patient-reported scale. designed to evaluate five dimensions of fatigue: general fatigue (items 1, 5, 12, 16), physical fatigue (items (items 2, 8, 14, 20), reduced motivation (items 3, 6, 10, 17), reduced activity (items 4, 9, 15, 18), and mental fatigue (items 7, 11, 13, 19) (Smets-1995). Items are scored 1-5, with 10 positively phrased items reverse scored (items 2, 5, 9, 10, 13, 14, 16, 17, 18, 19). This scale has been used to assess treatment outcomes in patients with chronic fatigue syndrome, women with fibromyalgia, Parkinson's disease, patients undergoing anti-cancer treatment, and the impact of fatigue on the quality of life in rheumatoid arthritis. Total scale score, and each of the 5 subscales scores will be calculated. MFI subscales are scored by summing four items, each has five possible responses giving a range of possible scores from 4 to 20.

Time to sustained clinical resolution
Day 1 to 90

Time to sustained clinical resolution of all the following symptoms of babesiosis: sweats, joint aches, cough, loss of appetite, muscle aches, headache, chills or shivering, feeling hot or feverish, nausea, fatigue (low energy or tiredness), and vomiting. The time to achieve sustained clinical resolution will be the date when patients first self-report a 7-day period without these symptoms relative to the start of tafenoquine or placebo treatment.

Number of Patients With Clinical Recovery of COVID-19 Symptoms on Day 14
Day 14 [± 1 day]

Clinical recovery from COVID-19 symptoms was defined as: temperature \< or equal to 37.7 degrees Celsius (surface by infra-red or oral), respiratory rate \< or equal to 24/minute on room air, shortness of breath is absent on a patient-report scale, and cough is mild or absent on a patient-reported scale.

Serious Ophthalmic Safety Event
After 12 months of exposure to study drug

Number of Participants with One or More protocol-defined serious ophthalmic safety event (SOSE) assessed by retinal changes from baseline using SD-OCT and qFAF. SOSE is assessed by significant retinal changes from baseline using SD-OCT and qFAF.

Secondary Endpoints

Babesia nucleic acid test (NAT)
From baseline until Day 90 of treatment.
Babesia nucleic acid test (NAT) and RT PCR
From baseline, Days 30, 60, 90, 120, and 180
Difference in TTMC between TQ and placebo
Day 1 to 90
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TafenoquineEXPERIMENTALTafenoquine (2 x 100 mg tablets) will be self-administered orally with food on Days 1, 2, 3, 4, then weekly thereafter for a total 12-week treatment period. Weekly treatment will start on Day 11 and end on Day 89.
Group 1ACTIVE_COMPARATORTQ: 2 x 100 mg TQ tablets orally on Days 1, 2, 3, and 4
Group 2PLACEBO_COMPARATORPlacebo: 2 x 100 mg placebo tablets orally on Days 1, 2, 3, and 4
PlaceboPLACEBO_COMPARATORPlacebo two tablets 1x/day on Days 1,2,3 and 10
Tafenoquine 200 mg (2 x 100 mg tablets)ACTIVE_COMPARATORTafenoquine 200 mg (2 x 100 mg tablets) daily for three consecutive days, followed by study treatment (tafenoquine 200 mg or placebo) once per week for 51 weeks

Interventions

NameTypeDescription
Tafenoquine 100mgDRUGTafenoquine
TafenoquineDRUGOral Tafenoquine
PlaceboOTHERPlacebo
Tafenoquine Oral TabletDRUGPatients will be randomized and will receive and self-administer 200 mg Tafenoquine or matching placebo on Days 1, 2, 3, and 10.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * Male or female, aged ≥ 18 years * Severe disabling fatigue * Have at least one common symptom of babesiosis * Have laboratory evidence of exposure to babesia in the last 12 months * Able and willing to give written informed consent * Able and willing to perform all study asses...

Countries:United StatesAustralia
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Frequently asked questions about Tafenoquine

What is Tafenoquine used for?

Tafenoquine is an investigational small molecule being studied for infectious diseases, including babesiosis, chronic babesiosis, and COVID-19. It is also being evaluated in healthy volunteers for safety. The drug is in Phase 2 clinical development and has received orphan drug designation.

Who makes Tafenoquine?

Tafenoquine is being developed by 60 Degrees Pharmaceuticals, Inc., a company traded on the stock exchange under the ticker SXTP. The company is conducting clinical trials of tafenoquine across multiple infectious disease indications.

What phase is Tafenoquine in?

Tafenoquine is in Phase 2 clinical development. It is an investigational drug, meaning it has not been approved by the FDA. The drug has received orphan drug designation from the FDA for its development program.

What clinical trials is Tafenoquine in?

Tafenoquine has been studied in several clinical trials. NCT03320174 was a long-term safety study in healthy volunteers. NCT04533347 evaluated tafenoquine in patients with mild to moderate COVID-19. NCT06207370 is testing oral tafenoquine plus standard of care for babesiosis, and NCT06656351 is the B-FREE study for chronic babesiosis.

Is Tafenoquine the same as Tafenoquine 100mg?

Yes, Tafenoquine 100mg refers to the same drug, tafenoquine. The 100mg designation indicates the dosage strength used in clinical studies. Tafenoquine is being developed by 60 Degrees Pharmaceuticals under the ticker SXTP.

How does Tafenoquine work?

Tafenoquine is a small molecule drug. Its specific molecular target has not been disclosed in public clinical trial information. The drug is being investigated for its potential effects in infectious disease conditions such as babesiosis and COVID-19.