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Description
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Tacrolimus, previously known as FK506, is the active ingredient in Tacrolimus Capsules, USP. Tacrolimus is a calcineurin-inhibitor immunosuppressant produced by Streptomyces tsukubaensis. Chemically, tacrolimus is designated as [3S[3R*[E(1S*,3S*,4S*)], 4S*, 5R*, 8S*, 9E, 12R*, 14R*, 15S*, 16R*, 18S*,19S*,26aR*]] -5,6,8,11,12,13,14,15,16,17,18,19,24,25,26,26a-hexadecahydro-5,19-dihydroxy-3-[2-(4-hydroxy-3-methoxycyclohexyl)-1-methylethenyl]-14,16-dimethoxy-4,10,12,18-tetramethyl-8-(2-propenyl)-15,19-epoxy-3H-pyrido[2,1-c][1,4] oxaazacyclotricosine-1,7,20,21(4H,23H)-tetrone, monohydrate. The chemical structure of tacrolimus is. Tacrolimus has an empirical formula of C44H69NO12H2O and a formula weight of 822.03. Tacrolimus appears as white crystals or crystalline powder. It is practically insoluble in water, freely soluble in ethanol, and very soluble in methanol and chloroform. Tacrolimus Capsules, USP is available for oral administration as capsules containing the equivalent of 0.5 mg, 1 mg or 5 mg of anhydrous tacrolimus USP. Inactive ingredients include anhydrous lactose NF DT, hypromellose USP, croscarmellose sodium NF, and magnesium stearate NF. The 0.5 mg capsule shell contains gelatin, titanium dioxide, and yellow iron oxide, and the 1 mg capsule shell contains gelatin and titanium dioxide, and the 5 mg capsule shell contains gelatin, titanium dioxide and red iron oxide. Non-volatile components of the ink are Shellac Glaze, Iron Oxide Red, and Simethicone USP. USP Dissolution Test 6 is used. USP Organic Impurities Procedure 2 is used.
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