The Mumbai-based firm has received final approval from the US Food and Drug Administration (USFDA) for its Lamivudine tablets in strengths of 150 mg and 300 mg, Lupin Ltd said in a statement.
Lupin Pharmaceuticals Inc (LPI), the company's US subsidiary, would commence marketing the product shortly, it added.
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Epivir tablets are indicated in combination with other antiretroviral agents for the treatment of human immunodeficiency virus (HIV-1) infection.
According to IMS MAT September 2014 sales data, Epivir tablets had annual US sales of $39.7 million.
Lupin shares were trading at Rs 1,401 apiece on the BSE, down 0.12% from their previous close.