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Condition Guide

New Treatments & Clinical Trials for Hepatitis B

Last updated May 2026Data from ClinicalTrials.gov204 active trials
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Hepatitis B affects nearly 300 million people worldwide and is the leading cause of liver cancer. Existing antivirals control the virus and prevent liver damage but rarely produce a cure. Research is now intensely focused on functional cures — driving the virus to undetectable levels without lifelong medication.

What's actually going on in research

Trials are testing siRNA drugs that silence viral proteins, antisense oligonucleotides, capsid inhibitors, therapeutic vaccines, and combinations aimed at functional cure. Researchers are also studying treatment in pregnancy, hepatitis B and D coinfection, and screening to find the millions of people unaware they are infected.

Functional cure

Combinations of siRNA drugs, capsid inhibitors, and therapeutic vaccines are aiming to drive hepatitis B into long-term remission without lifelong medication. Late-stage trials are underway.

New drug classes

siRNA drugs silence viral proteins, while capsid inhibitors block virus assembly. Each works differently from current antivirals and may be most powerful in combination.

Hepatitis D coinfection

Bulevirtide, a new drug for hepatitis B and D coinfection, is approved in Europe and being studied in the US. It is the first targeted treatment for the most severe form of viral hepatitis.

What to know before you search

Eligibility often depends on viral load, liver function, presence of liver damage, hepatitis B surface antigen levels, and hepatitis D coinfection.

What types of trials are currently open

  • Treatment trialsTesting new antivirals, siRNA drugs, and combinations aimed at controlling or curing hepatitis B.
  • Functional cure trialsTesting combinations of new drugs to drive hepatitis B into long-term remission off medication.
  • Vaccine trialsTesting therapeutic vaccines designed to help the immune system control hepatitis B.
  • Hepatitis D trialsTesting treatments for hepatitis B and D coinfection.
  • Observational studiesFollowing people with hepatitis B to understand liver disease, cancer risk, and treatment response.

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