Lamivudine 150 Mg Tablets

Q1: What is Lamivudine 150mg (Lamivir 150) used for?

Lamivudine 150mg is the HIV-treatment dose of this NRTI. It is a core component of most HIV combination regimens. The 150mg tablet is used twice daily (300mg total) or combined as 300mg once-daily in fixed-dose combinations with Zidovudine or Abacavir.

Q2: How does the HIV-dose 150mg differ from the HBV-dose 100mg?

The 150mg twice-daily dose (300mg/day) provides the drug exposure needed for HIV suppression. The 100mg once-daily dose was specifically approved for HBV therapy. The 300mg/day HIV dose also suppresses HBV effectively in co-infected patients.

Q3: How is Lamivudine 150mg taken for HIV?

Take 150mg twice daily (every 12 hours) or as directed. Can be taken with or without food. Consistent timing is important for maintaining stable drug levels throughout the day.

Q4: What are the most common side effects?

Lamivudine 150mg is among the best-tolerated HIV drugs. Common side effects include mild nausea, diarrhea, headache, insomnia, and fatigue — typically mild and transient. Pancreatitis is rare.

Q5: What is the M184V resistance mutation and why does it matter?

The M184V mutation in HIV reverse transcriptase causes high-level Lamivudine resistance. However, this mutation also reduces viral fitness and importantly, increases susceptibility to other NRTIs like Tenofovir and Zidovudine. Understanding this is important when managing treatment failure.

Q6: What happens when Lamivudine is stopped in HBV co-infected patients?

Stopping Lamivudine in HIV/HBV co-infected patients without maintaining an HBV-active drug can cause a severe acute hepatitis flare with significantly elevated ALT and potential liver decompensation. This is critically important — always ensure continued HBV coverage.

Q7: Is Lamivudine 150mg safe for kidney disease?

Dose reduction is required for significant renal impairment (eGFR <30 ml/min). Renal function should be assessed at baseline. Lamivudine has low nephrotoxicity compared to some other NRTIs.

Q8: Can Lamivudine 150mg be used during pregnancy?

Yes. Lamivudine has extensive safety data in pregnancy and is included in most HIV-in-pregnancy guidelines. It is also used for HBV transmission prevention in the third trimester of pregnancy in HBV-infected mothers.

Q9: What monitoring is required during Lamivudine therapy?

CD4 count and viral load every 3–6 months. Liver function tests, especially in HBV co-infected patients. Regular renal function monitoring. Monitor for early signs of pancreatitis.

Q10: Does Lamivudine interact with HIV medications?

Lamivudine has minimal significant drug interactions. Sorbitol-containing medications can reduce Lamivudine absorption — avoid co-administration. Trimethoprim may slightly increase Lamivudine levels through renal tubular competition.

Q11: How should Lamivudine 150mg be stored?

Store at room temperature away from light and moisture. Keep in original packaging out of reach of children. Do not use after the expiry date.

Q12: Do I need a prescription?

Yes. Lamivudine 150mg requires specialist HIV prescribing with baseline viral load and CD4 testing, plus ongoing monitoring throughout treatment.