lamivudine and tenofovir disoproxil fumarate - Generic Medications

CIMDUO tablets contain lamivudine (also known as 3TC), a synthetic nucleoside analogue with activity against HIV-1 and tenofovir disoproxil fumarate or tenofovir DF, a fumaric acid salt of bis-isopropoxycarbonyloxymethyl ester prodrug of tenofovir. In vivo tenofovir DF is converted to tenofovir, an acyclic nucleoside phosphonate (nucleotide) analog of adenosine 5’-monophosphate. Tenofovir exhibits activity against HIV-1 reverse transcriptase. The chemical name of lamivudine is (-)-1-[2 R ,5 S ) - 2-Hydroxymethyl)-1,3-oxathiolan-5-yl]cytosine. Lamivudine is the (-)enantiomer of a dideoxy analogue of cytidine. Lamivudine has also been referred to as (-)2′,3′-dideoxy, 3′-thiacytidine. It has a molecular formula of C 8 H 11 N 3 O 3 S and a molecular weight of 229.26 g per mol. It has the following structural formula: Lamivudine is a white to off-white solid with a solubility of approximately 70 mg per mL in water at 20°C. The chemical name of tenofovir DF is 9-[(R)-2-[[Bis[[(isopropoxycarbonyl)oxy]methoxy]phosphinyl]methoxy]propyl]adenine fumarate (1:1). It has a molecular formula of C 19 H 30 N 5 O 10 P•C 4 H 4 O 4 and a molecular weight of 635.51. It has the following structural formula: Tenofovir DF is a white to off-white powder with a solubility of 13.4 mg/mL in distilled water at 25°C. It has an octanol/phosphate buffer (pH 6.5) partition coefficient (log p) of 1.25 at 25°C. CIMDUO tablets are for oral administration. Each film-coated tablet contains 300 mg of lamivudine and 300 mg of tenofovir disoproxil fumarate, which is equivalent to 245 mg of tenofovir disoproxil, and the following inactive ingredients: croscarmellose sodium, lactose monohydrate, magnesium stearate and microcrystalline cellulose. The tablet coating contains polyethylene glycol, titanium dioxide, polyvinyl alcohol and talc. Lamivudine Structural Formula Tenofovir Structural Formula