Fostemsavir Tromethamine is an antiretroviral medication for adults living with HIV/AIDS who have tried multiple HIV medications and whose HIV infection cannot be successfully treated with other therapies because of resistance, intolerance or safety considerations.

Fostemsavir is an HIV entry inhibitor and a prodrug of Temsavir (BMS-626529). Fostemsavir is a human immunodeficiency virus type 1 (HIV-1) gp120-directed attachment inhibitor.

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