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Bulevirtide

Phase 3FDA approved 2026

Chronic Hepatitis Delta | Small molecule | Infectious Disease |Gilead Sciences, Inc.|Trials Updated: Sep 18, 2025

Bulevirtide development status

FDA approval May 22, 2026 as Hepcludex
Approval holderGilead Sciences Inc
ApplicationBLA761468
Highest phase Phase 3
Registered trials 8 across 3 sponsors since Feb 2019

Label indication HEPCLUDEX is indicated for the treatment of chronic hepatitis delta virus (HDV) infection in adults without cirrhosis or with compensated cirrhosis. This indication is approved under accelerated approval based on a decrease in HDV RNA and alanine aminotransferase (ALT) normalization [see Clinical Studies (14) ] . An improvement in disease-related clinical outcomes has not been established. FDA label

Bulevirtide target and mechanism

Molecular targetSLC10A1
Target classInhibitor
ModalitySmall molecule

Also known as Bulevirtide (BLV), Myrcludex B, Hepcludex®

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials3
Total Enrollment366

FDA Designations

No designations recorded

Bulevirtide clinical trials

Bulevirtide · 3 trials · 2 indications

Phase 3 1Phase 2 1Phase 1 1
NCT03852719Study to Assess Efficacy and Safety of Bulevirtide in Participants With Chronic Hepatitis Delta (CHD)Chronic Hepatitis Delta
COMPLETED150 Analytics
PHASE3COMPLETED
Study to Assess Efficacy and Safety of Bulevirtide in Participants With Chronic Hepatitis Delta (CHD)
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Study Endpoints

Primary Endpoints

Percentage of Participants With Combined Response at Week 48
Week 48

Combined response was defined as fulfilment of two conditions simultaneously: Undetectable (\< lower limit of quantification (LLOQ, target not detected)) HDV RNA or decrease by ≥ 2 log10 IU/mL from baseline; and ALT normalization.

Percentage of Participants With Sustained Virological Response at Week 24 After the Scheduled End of Treatment (SVR24)
24 weeks after EOT (Week 72 for Arm A and study Week 120 for Arms B, C, and D)

SVR24 was defined as undetectable hepatitis delta virus (HDV) RNA (HDV RNA value \< lower limit of quantitation \[LLOQ\] with target not detected) at 24 weeks after the scheduled end of treatment (EOT).

Pharmacokinetic (PK) Parameter for Bulevirtide (BLV): AUCtau
Day 6: Predose (≤ 30 minutes before dose), 0.5, 1, 1.5, 2, 3, 4, 6, 9, 12, and 24 hours postdose

AUCtau is defined as the area under the concentration versus time curve over the dosing interval at steady state at Day 6.

PK Parameter for BLV: Cmax ss
Day 6: Predose (≤ 30 minutes before dose), 0.5, 1, 1.5, 2, 3, 4, 6, 9, 12, and 24 hours postdose

Cmax is defined as the maximum observed concentration of drug at steady state at Day 6.

Secondary Endpoints

Percentage of Participants With Undetectable HDV RNA at Week 48
Week 48
Percentage of Participants With Alanine Aminotransferase (ALT) Normalization at Week 48
Week 48
Change From Baseline in Liver Stiffness, as Measured by Elastography at Week 48
Baseline (Baseline for Delayed Treatment/Bulevirtide 10 mg/day is reset at Week 48), Week 48
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Delayed Treatment/Bulevirtide 10 mg/dayEXPERIMENTALAfter an observational period of 48 weeks, participants will receive treatment with bulevirtide 10 mg/day subcutaneously (SC) for 96 weeks and will be followed for up to 96 weeks (Up to Week 240).
Bulevirtide 2 mg/dayEXPERIMENTALParticipants will receive bulevirtide 2 mg/day SC for 144 weeks and will be followed for up to 96 weeks (Up to Week 240).
Bulevirtide 10 mg/dayEXPERIMENTALParticipants will receive bulevirtide 10 mg/day SC for 144 weeks and will be followed for up to 96 weeks (Up to Week 240).
Pegylated Interferon alfa-2a (PEG-IFN alfa)ACTIVE_COMPARATORParticipants will receive PEG-IFN alfa 180 microgram (mcg) once a week subcutaneously for 48 weeks with additional 48 weeks follow-up.
Bulevirtide 2 mg/day + PEG-IFN alfaEXPERIMENTALParticipants will receive bulevirtide 2 mg once a day subcutaneously incombination with PEG-IFN alfa 180 mcg once a week subcutaneously for 48 weeks followed by bulevirtide 2 mg once a day for 48 weeks and additional 48 weeks follow-up.
Bulevirtide 10 mg/day + PEG-IFN alfaEXPERIMENTALParticipants will receive bulevirtide 10 mg once a day subcutaneously in combination with PEG-IFN alfa 180 mcg once a week subcutaneously for 48 weeks followed by bulevirtide 10 mg once a day for 48 weeks and additional 48 weeks follow-up.
Bulevirtide 10 mg once a dayEXPERIMENTALParticipants will receive bulevirtide 10 mg once a day subcutaneously for 96 weeks with additional 48 weeks follow-up
Group A: BLV 2 mg (Severe RI Group)EXPERIMENTALParticipants with severe renal impairment (RI) \[estimated glomerular filtration rate (eGFR) ≥ 15 to ≤ 29 mL/min/1.73 m\^2\] will receive bulevirtide (BLV) 2 mg, administered subcutaneously (SC), once daily (QD), for 6 days.
Group A: BLV 2 mg (Matched Control)EXPERIMENTALParticipants with normal renal function (matched control group) \[eGFR ≥ 90 mL/min/1.73 m\^2\] will receive BLV 2 mg, administered SC, QD, for 6 days.
Group B: BLV 10 mg (Severe RI Group)EXPERIMENTALParticipants with severe RI \[eGFR ≥ 15 to ≤ 29 mL/min/1.73 m\^2\] will receive BLV 10 mg, administered SC, QD, for 6 days.
Group B: BLV 10 mg (Matched Control)EXPERIMENTALParticipants with normal renal function (matched control group) \[eGFR ≥ 90 mL/min/1.73 m\^2\] will receive BLV 10 mg, administered SC, QD, for 6 days.

Interventions

NameTypeDescription
BulevirtideDRUGAdministered via SC injections
Peginterferon Alfa-2a (PEG-IFN alfa)DRUGAdministered via subcutaneous injections
Bulevirtide (BLV)DRUGAdministered via subcutaneous (SC) injections
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersNo
Study Sites19

Inclusion Criteria: 1. Provision of signed and dated informed consent form. 2. Positive serum anti-hepatitis delta virus (HDV) antibody results or polymerase chain reaction (PCR) results for serum/ plasma HDV ribonucleic acid (RNA) for at least 6 months before screening. 3. Positive PCR results for...

Countries:United StatesGermanyItalyRussiaSwedenFranceMoldovaRomania
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Frequently asked questions about Bulevirtide

What is Bulevirtide used for?

Bulevirtide is used for the treatment of chronic hepatitis D infection and chronic hepatitis delta. It is an investigational small molecule developed by Gilead Sciences, Inc. (ticker: GILD) and is currently in Phase 1 clinical development.

What does Bulevirtide target?

Bulevirtide targets SLC10A1, also known as the sodium taurocholate co-transporting polypeptide (NTCP). It acts as an inhibitor of this target. By inhibiting SLC10A1, Bulevirtide blocks the entry of hepatitis D virus into hepatocytes.

Who is developing Bulevirtide?

Bulevirtide is being developed by Gilead Sciences, Inc., which trades under the ticker symbol GILD. Gilead is responsible for the clinical development of the drug for chronic hepatitis D infection and chronic hepatitis delta.

What phase is Bulevirtide in?

Bulevirtide is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. The Phase 1 program includes a completed study in participants with normal and impaired renal function.

What clinical trials is Bulevirtide in?

Bulevirtide has been studied in three completed clinical trials: NCT05760300, a Phase 1 renal impairment study; NCT03852719, a Phase 3 trial in chronic hepatitis delta; and NCT03852433, a Phase 2 trial combining Bulevirtide with pegylated interferon alfa-2a.

Is Bulevirtide the same as BLV?

Yes, Bulevirtide is also known as BLV. Bulevirtide (BLV) is the same drug. The abbreviation BLV is sometimes used in scientific literature and clinical trial descriptions to refer to Bulevirtide.