Tenofovir for Hepatitis B Infection (Viread, Vemlidy)
Comprehensive guide to tenofovir (Viread, Vemlidy) for managing chronic hepatitis B: usage, benefits, side effects, and long-term care.
Tenofovir is an effective antiviral medication used to treat chronic hepatitis B infection in adults and children over 2 years of age, available as Viread and Vemlidy in tablet and granule forms.
About tenofovir for hepatitis B infection
| Type of medicine | A nucleoside reverse transcriptase inhibitor antiretroviral medicine |
|---|---|
| Used for | Chronic hepatitis B in adults and in children over 2 years of age |
| Also called | Viread ; Vemlidy |
| Available as | Tablets and granules |
Tenofovir belongs to a class of drugs known as nucleoside reverse transcriptase inhibitors (NRTIs). It targets the hepatitis B virus (HBV), which spreads through the bloodstream to the liver, causing inflammation and potential long-term damage. In chronic hepatitis B, the virus persists, often requiring antiviral therapy to suppress replication and prevent liver complications like cirrhosis or cancer.
By interfering with the virus’s reverse transcriptase enzyme, tenofovir halts HBV multiplication, significantly reducing viral load in the blood. This approach limits liver damage progression. Treatment is typically initiated by a liver specialist (hepatologist) and may last several years, sometimes combining tenofovir with other antivirals for optimal control. Unlike curative options, tenofovir manages the infection long-term and does not fully eradicate HBV or prevent transmission.
Two main formulations exist: tenofovir disoproxil fumarate (TDF, Viread) and tenofovir alafenamide (TAF, Vemlidy). TAF offers improved renal and bone safety over TDF, making it preferable for long-term use, especially in patients with kidney concerns. Long-term studies show TAF achieves high viral suppression rates (up to 90% at 5 years) with no resistance and better tolerability.
Before taking tenofovir
Before starting tenofovir, disclose your full medical history to your doctor to ensure safety. Key considerations include:
- Pregnancy, plans to conceive, or breastfeeding: Tenofovir is generally avoided unless benefits outweigh risks; discuss alternatives.
- Liver or kidney impairment: Dose adjustments or monitoring may be needed, as the drug is cleared renally.
- Bone conditions like osteoporosis or fracture risk: Tenofovir can affect bone density, particularly TDF; TAF is safer.
- Heavy alcohol use: Increases liver strain, potentially worsening outcomes.
- Concurrent medications: Interactions possible with nephrotoxic drugs or other antivirals; provide a full list including over-the-counter and herbal products.
- Allergies: Report prior reactions to tenofovir or similar drugs.
For pregnant women with high HBV DNA (>10^7 IU/ml) in the third trimester, tenofovir disoproxil is recommended to reduce mother-to-child transmission. Regular monitoring is essential throughout treatment.
How to take tenofovir for hepatitis B infection
Follow your doctor’s precise instructions and read the patient information leaflet for detailed guidance on administration and side effects.
Adult dosing: Typically one 245 mg tablet (TAF, Vemlidy) or 300 mg (TDF, Viread) once daily, taken orally with or without food. Swallow whole; do not crush or chew.
Pediatric dosing (children children
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