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Tobevibart

Phase 3

Viral Hepatitis | Small molecule | Infectious Disease |Vir Biotechnology, Inc.|Last Updated: Jul 13, 2026

Target and mechanism

Molecular targetHBsAg
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLEDDMC
Total Trials3
Total Enrollment374

FDA Designations

FAST_TRACK

Clinical trial landscape

Tobevibart · 3 trials · 1 indication

Phase 3 2Phase 2 1
NCT07128550A Study to Evaluate Tobevibart+Elebsiran in Participants With Chronic HDV Infection Not Virologically Suppressed With BulevirtideViral Hepatitis
ACTIVE NOT_RECRUITING150 Analytics
NCT06903338A Study to Evaluate Tobevibart + Elebsiran in Chronic HDV InfectionViral Hepatitis
ACTIVE NOT_RECRUITING124 Analytics
PHASE3ACTIVE NOT_RECRUITING
A Study to Evaluate Tobevibart+Elebsiran in Participants With Chronic HDV Infection Not Virologically Suppressed With Bulevirtide
Viral HepatitisUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Study to Evaluate Tobevibart + Elebsiran in Chronic HDV Infection
Viral HepatitisUnlock trial analytics

Study Endpoints

Primary Endpoints

HDV RNA < Lower Limit of Quantification (LLOQ), Target not detected (TND) at Week 24
Week 24
HDV RNA < Lower Limit of Quantification (LLOQ), Target not detected (TND) 24 weeks after end of treatment.
24 Weeks after End of Treatment
HDV RNA < Lower Limit of Quantification (LLOQ), Target Not Detected (TND) and alanine aminotransferase (ALT) normalization (ALT </= Upper Limit of Normal [ULN]) at Week 48 for Arm 1 vs at Week 12 for Arm 2
Up to 48 weeks
Incidence of Treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs) through Week 12
Up to 12 weeks
HDV RNA < Lower Limit of Quantification (LLOQ), Target not detected (TND) at Week 48
Week 48
HDV RNA < Lower Limit of Quantification (LLOQ), Target not detected (TND) 24 weeks after end of treatment
24 Weeks after End of Treatment
Incidence of treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs) through Week 48
Week 48

Secondary Endpoints

Incidence of Treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs) through Week 24, Week 48, Week 96, Week 120, Week 144, Week 192, and Week 240
Week 24, Week 48, Week 96, Week 120, Week 144, Week 192, and Week 240
HDV RNA < Lower Limit of Quantification (LLOQ), Target not detected (TND) at Week 48, Week 96, Week 120, Week 144, Week 192 and Week 240
Week 48 , Week 96, Week 120, Week 144, Week 192 and Week 240
Change from baseline in ALT at Week 24, Week 48, Week 96, Week 120, Week 144, Week 192, and Week 240
Week 24, Week 48, Week 96, Week 120, Week 144, Week 192, and Week 240
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm 1EXPERIMENTALParticipants will receive treatment with tobevibart + elebsiran up to 240 weeks.
Arm 2EXPERIMENTALParticipants will receive Bulevirtide for 24 weeks and switch to receive tobevibart + elebsiran for additional 216 weeks
Arm 1 (Tobevibart + Elebsiran)EXPERIMENTALParticipants will receive treatment with tobevibart + elebsiran for 240 weeks.
Arm 2 (Tobevibart + Elebsiran)EXPERIMENTALParticipants will receive tobevibart + elebsiran after an observational period for 240 weeks.

Interventions

NameTypeDescription
TobevibartDRUGTobevibart administered by subcutaneous injection
ElebsiranDRUGElebsiran administered by subcutaneous injection
BulevirtideDRUGBulevirtide administered by subcutaneous injection
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Eligibility Criteria

Age Range18 Years to 70 Years
SexALL
Healthy VolunteersNo
Study Sites38

Inclusion Criteria: 1. Male or female ages 18 to 70 years at screening 2. HDV RNA ≥ 500 IU/mL at screening 3. Receiving BLV 2 mg SC QD for ≥ 24 weeks at Day 1 4. Noncirrhotic or compensated cirrhotic liver disease at screening 5. On NRTI therapy against HBV for at least 12 weeks prior to day 1 or h...

Countries:AustriaFranceGermanyItalyRomaniaSpainUnited KingdomUnited StatesCanadaGeorgiaMoldovaNew ZealandPakistanUkraineBelgiumBulgariaNetherlands
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Recent Changes (Last 90 Days)

MEDIUMJul 13, 2026NCT07128550Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMJul 13, 2026NCT07128550Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about Tobevibart

What is Tobevibart used for?

Tobevibart is an investigational small molecule being developed for the treatment of viral hepatitis, specifically chronic hepatitis D virus (HDV) infection. It is currently in Phase 3 clinical development and has received Fast Track designation from the FDA. Tobevibart is being studied in combination with elebsiran in multiple clinical trials.

Who makes Tobevibart?

Tobevibart is being developed by Vir Biotechnology, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol VIR. The company is conducting Phase 3 clinical trials to evaluate the drug in patients with chronic HDV infection, including those who have not achieved virologic suppression with existing therapies.

What phase is Tobevibart in?

Tobevibart is in Phase 3 clinical development for chronic hepatitis D virus infection. It has received Fast Track designation from the FDA, which is intended to expedite the development and review of drugs that treat serious conditions and fill unmet medical needs. The drug remains investigational and has not been approved by regulatory authorities.

What clinical trials is Tobevibart in?

Tobevibart is being evaluated in three active clinical trials. NCT06903338 is a Phase 3 study in chronic HDV infection with 124 participants. NCT07128550 is a Phase 3 study in patients not virologically suppressed with bulevirtide, enrolling 150 participants. NCT07142811 is a Phase 2 study comparing Tobevibart plus elebsiran versus bulevirtide, with 100 participants.

Is Tobevibart FDA approved?

No, Tobevibart is not FDA approved. It is an investigational drug currently in Phase 3 clinical trials for chronic hepatitis D virus infection. The FDA has granted it Fast Track designation, which facilitates development and review, but the drug has not yet received marketing approval. Its safety and efficacy are still being evaluated in clinical studies.