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Overview

Lamivudine, also known as 3TC, is an oral antiviral medicine used to treat HIV and chronic hepatitis B. It belongs to the class of nucleoside reverse transcriptase inhibitors (NRTIs). The drug works by blocking an enzyme that the virus needs to replicate. It acts as a building block that ends the virus’s copies and slows the spread of infection.

How is Lamivudine Used?

Lamivudine is taken by mouth. The exact dose and schedule depend on the infection, body weight, and kidney function. It is usually given as tablets or a liquid. People with HIV often take lamivudine twice daily as part of a fixed‑dose combination. In hepatitis B, daily dosing may differ. Do not change the dose without a clinician’s advice. Use medicinal products exactly as prescribed.

What It Treats

In HIV, lamivudine is used as part of combination therapy. For chronic hepatitis B, it helps reduce liver inflammation and slow damage. Lamivudine is not a stand‑alone cure. Stopping treatment can allow the virus to come back and may worsen liver disease in HBV patients.

Effectiveness and Safety

Effectiveness and safety vary by person. Many patients tolerate lamivudine well, and it has a gentle safety profile compared with some antivirals. It can be used in long courses when monitored by a doctor. Regular medical checkups and viral load testing help assess progress and catch any issues early. Adherence improves long‑term outcomes and helps protect kidney function and liver health.

Common Side Effects

Common side effects include headache, nausea, diarrhea, fatigue, or dizziness. Some people notice rash, insomnia, or stomach upset. Most side effects are mild and improve with time. Rare but serious risks include lactic acidosis with liver enlargement and pancreatitis, which require urgent medical care. Seek immediate help for severe abdominal pain, shortness of breath, confusion, or chest pain.

Interactions and Warnings

Lamivudine does not strongly interact with many drugs, but it can interact with other HIV medicines and nephrotoxic drugs. Always tell your clinician about all medicines you take, including herbal products. In HBV infection, stopping lamivudine can cause a flare of hepatitis, so gradual tapering under supervision is important. The drug is cleared by the kidneys, so dose adjustments may be needed in kidney disease. Pregnant women should discuss benefits and risks with their doctor.

Storage and Availability

Lamivudine is available as generics and under brand names in many pharmacies. Store tablets at room temperature, away from light and moisture, and keep them in their original packaging until use. Do not use medicines past their expiry date. If you have a disability or require storage assistance, ask a caregiver or pharmacist for help.

Tips for Use and Adherence

Take lamivudine exactly as prescribed. Set a daily reminder to help with consistency. You may take it with or without food unless your doctor advises otherwise. If you miss a dose, take it as soon as you remember, unless it is almost time for your next dose. Do not double up doses to compensate for a missed one. Keep a list of medicines and share it with every health care provider to avoid unintended interactions.