Lamivir 150 Tablet contains Lamivudine 150mg, an antiretroviral medication primarily used in the treatment of Human Immunodeficiency Virus (HIV) infection and chronic Hepatitis B virus (HBV) infection. Lamivudine is a nucleoside reverse transcriptase inhibitor (NRTI) that works by inhibiting the activity of reverse transcriptase, an enzyme critical for viral replication. By incorporating into the viral DNA chain, Lamivudine causes premature termination of DNA synthesis, thereby reducing viral load and slowing disease progression. Lamivir 150 is indicated as part of combination antiretroviral therapy for managing HIV-1 infection and as monotherapy or in combination for chronic hepatitis B patients with evidence of active viral replication and liver inflammation. The medication is generally well tolerated, with common adverse effects including headache, fatigue, nausea, and diarrhea. Rare but serious side effects may include lactic acidosis and hepatomegaly with steatosis, necessitating close monitoring during treatment. Lamivir 150 should be administered under medical supervision, with dosage adjustments considered in patients with renal impairment. It is essential to adhere strictly to prescribed regimens to prevent the development of resistance. Lamivir 150 provides an effective therapeutic option in the management of viral infections, contributing to improved clinical outcomes and quality of life.