Hepatitis B Drug Summary

Last updated: 15 May 2025

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Immunoglobulin


Drug Dosage Remarks
Hepatitis B Immunoglobulin
(Hepatitis B Ig)
Individualize dose based on manufacturer’s recommendations
Adverse Reactions
  • Post-injection local reactions, hypersensitivity reactions
Special Instructions
  • Monitor serum anti-HBs level at least every 2-4 weeks for 6 months; serum HBsAg, LFT, and infusion-related adverse events (liver transplant)

Interferons



Drug Dosage Duration Remarks
Interferon alfa-2a Chronic Hepatitis B:
3-4.5 MIU SC/IM 3x/week

6 months

Adverse Reactions
  • Influenza-like symptoms (fatigue, fever, headache, myalgia, arthralgia); Neuropsychiatric effects (depression, mood swings, irritability, somnolence); Hematological effects (granulocytopenia, thrombocytopenia); CV effects (chest pain, edema, hypertension); Other effects (pain at injection site, dyspepsia, alopecia, thyroid function abnormalities)
  • May cause or aggravate fatal or life-threatening infectious or ischemic disorders
Special Instructions
  • Contraindicated in patients with decompensated liver disease, autoimmune hepatitis
  • Use with caution in patients with hepatic or renal impairment, depression or psychiatric disorders, cardiovascular disease, arrhythmias, hypertension, pre-existing thyroid disease
  • Maintain adequate hydration during treatment
  • Withdraw drug if jaundice occurs
  • Monitor LFT
Interferon alfa-2b Chronic Hepatitis B:
5 MIU SC/IM 24 hourly or
3-10 MIU SC/IM 3x/week
4-6 months
Chronic Hepatitis D:
5 MIU/m2 SC 3x/week
 ≥3-4 months
Peginterferon alfa-2a Chronic Hepatitis B:
180 mcg SC once weekly

12 months

Nucleoside & Nucleotide Reverse Transcriptase Inhibitors


Drug Dosage1 Remarks
Adefovir dipivoxil Chronic Hepatitis B:
10 mg PO 24 hourly
Adverse Reactions
  • GI effects (nausea, flatulence, diarrhea, dyspepsia, abdominal pain); Dermatologic effects (skin rashes, pruritus); Respiratory effects (cough, pharyngitis, sinusitis); Other effect (headache)
  • At high doses: Nephrotoxicity (renal tubular dysfunction resembling Fanconi syndrome, deterioration in renal function)
Special Instructions
  • Use with caution in patients with hepatic or renal impairment
  • May need to reduce dosage in patients with renal impairment
Clevudine Chronic Hepatitis B:
30 mg PO 24 hourly
Adverse Reactions
  • GI effects (dyspepsia, abdominal pain); Other effects (upper respiratory infections, asthenia, headache)
Special Instructions
  • Contraindicated in patients with renal impairment
  • Use with caution in patients with lactic acidosis and severe hepatomegaly with steatosis
Entecavir Chronic Hepatitis B in nucleoside-treatment-naive:
0.5 mg PO 24 hourly
Adverse Reactions
  • CNS effects (headache, fatigue, dizziness, somnolence); GI effects (nausea/vomiting, dyspepsia, increase in ALT that generally resolves with continued treatment); Other effects (edema, ascites, hyperglycemia)
Special Instructions
  • It is advised that patients should be immunized with meningococcal vaccines at least 2 weeks prior to initiation of therapy
  • Use with caution in patients with active infection
Chronic Hepatitis B with known Lamivudine resistance or history of hepatitis B viremia while using Lamivudine:
1 mg PO 24 hourly
Lamivudine
Chronic Hepatitis B:
100 mg PO 24 hourly
Adverse Reactions
  • GI disturbances (abdominal pain, nausea/vomiting, diarrhea; mild increases in ALT levels that generally resolves with continued treatment); Respiratory effects (cough, nasal symptoms); CNS effects (malaise, fever); Musculoskeletal effects (arthralgia, musculoskeletal pain, peripheral neuropathy); Other effects (rash, alopecia)
Special Instructions
  • Use with caution in patients with hepatomegaly and hepatic impairment
Telbivudine Chronic Hepatitis B:
600 mg PO 24 hourly
Adverse Reactions
  • CNS effects (dizziness, headache); GI effects (diarrhea, increased blood amylase, nausea; increased ALT levels that generally resolves with continued treatment); Other effects (rash, fatigue)
Special Instructions
  • Use with caution in patients with renal impairment
Tenofovir alafenamide
Chronic Hepatitis B:
25 mg PO 24 hourly  
Adverse Reactions
  • Significant reactions: Acute renal failure, Fanconi syndrome, lactic acidosis, hepatomegaly with steatosis
  • GI effects (abdominal pain, nausea); Other effects (headache, fatigue, cough, back pain)
Special Instructions
  • Test patients for HIV-1 infection prior to initiation of treatment
  • Due to the risk of developing HIV-1 resistance in patients coinfected with HBV and HIV-1, monotherapy is not recommended for the treatment of HIV-1 infection
  • Assess serum creatinine and phosphorous, estimated CrCl, and urine glucose and protein before initiating and during therapy in all patients as clinically appropriate
  • Not recommended in patients with decompensated hepatic impairment or end-stage renal disease
  • Discontinue in patients who develop clinically significant decreases in renal function or evidence of Fanconi syndrome and in any patient who develops clinical or laboratory findings suggestive of lactic acidosis or pronounced hepatotoxicity; discontinuation of therapy may result in severe acute exacerbations of hepatitis B
  • Patients who discontinue therapy should be closely monitored with both clinical and laboratory follow-up for at least several months after stopping treatment
Tenofovir disoproxil fumarate
Chronic Hepatitis B:
300 mg PO 24 hourly
Adverse Reactions
  • Significant reactions: Decreased bone mineral density, acute renal failure, Fanconi syndrome, lactic acidosis, hepatomegaly with steatosis
  • CNS effects (insomnia, dizziness, depression); GI disturbances (nausea, flatulence, diarrhea, abdominal pain); Other effects (pruritus, fatigue)
Special Instructions
  • Perform HIV test prior to therapy
  • Due to the risk of developing HIV-1 resistance in patients coinfected with HBV and HIV-1, monotherapy is not recommended for the treatment of HIV-1 infection
  • Use with caution in patients with hepatic or renal impairment
  • May need to reduce dosage in patients with renal impairment
  • Do not use concurrently with other nucleotide reverse transcriptase inhibitors
1Recommended treatment duration for nucleos(t)ide analogue-based therapy is ≥1 year.

Vaccines


Drug Dosage Remarks
Hepatitis A and B vaccine Individualize dose based on manufacturer’s recommendations and local immunization guidelines
Adverse Reactions
  • Post-injection local reactions; CNS effects (fever, headache, malaise, dizziness, sleep disturbance); GI effect (abdominal pain); Hypersensitivity reactions
Special Instructions
  • Give by SC route in patients with impaired immunity or with bleeding disorders
Hepatitis B vaccine1
Individualize dose based on manufacturer’s recommendations and local immunization guidelines
Adverse Reactions
  • Post-injection local reactions; CNS effects (fever, headache, malaise, dizziness, sleep disturbance); GI effect (abdominal pain); Hypersensitivity reactions
Special Instructions
  • The deltoid region as a site for injection is recommended for adults and the anterolateral thigh for infants
  • Injection in the gluteal region has been associated with diminished response

1Hepatitis B vaccine is also available in combination with diphtheria, tetanus, pertussis, Haemophilus influenzae type B and/or polio vaccines. For available formulations, please refer to the latest MIMS.

Immunological

Other Therapeutic Agent

Drug Dosage Remarks
Thymosin alpha-1
(Thymalfasin)
Chronic Hepatitis B as monotherapy or in combination with Interferon therapy:
1.6 mg SC 2x/week with 3-4 days interval for 6-12 months
Adverse Reactions
  • Discomfort at injection site, redness, polyarthralgia with hand edema and rash
Special Instructions
  • Use with caution in pregnant and lactating women
  • Monitor liver functions regularly
  • Contraindicated in patients with hypersensitivity to thymosin alpha-1 and those immunosuppressed following transplantation

Disclaimer

All dosage recommendations are for non-pregnant and non-breastfeeding women and non-elderly adults with normal renal and hepatic function unless otherwise stated. 
Not all products are available or approved for above use in all countries. 
Products listed in the Drug Summary are based on indications stated in the locally approved product monographs. 
Please refer to local product monographs in Related MIMS Drugs for country-specific prescribing information.