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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 [3 S[3 R*[ E(1 S*,3 S*,4 S*)], 4 S*,5 R*,8 S*,9 E,12 R*,14 R*,15 S*,16 R*,18 S*,19 S*,26a R*]] - 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)-1methylethenyl]-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 C 44H 69NO 12H 2O 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 containing the equivalent of 0.5 mg, 1 mg or 5 mg of anhydrous tacrolimus USP. Inactive ingredients include anhydrous lactose, hypromellose, croscarmellose sodium and magnesium stearate. The 0.5 mg capsule shell contains gelatin, titanium dioxide and ferric oxide yellow, the 1 mg capsule shell contains gelatin and titanium dioxide, and the 5 mg capsule shell contains gelatin, titanium dioxide and ferric oxide red. Tacrolimus capsules, USP 0.5mg and 1mg are printed with red imprinting ink. Tacrolimus capsules, USP 5mg is printed with red imprinting ink and white imprinting ink. The non-volatile ingredients in the red imprinting ink are shellac, FD&C Yellow #6, D&C Red #7 and titanium dioxide. The non-volatile ingredients in the white imprinting ink are shellac and titanium dioxide. Tacrolimus Capsules meet USP Organic Impurities Test Procedure 1and USP Organic Impurities Test Procedure 2. FDA approved dissolution test specifications differ from USP.
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