SPL Set ID: 450c3e32-6d91-4508-b064-49b293e86cec

Tacrolimus, previously known as FK506, is the active ingredient in Tacrolimus capsules. 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)-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 C 44 H 69 NO 12 ●H 2 O 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 is available for oral administration as capsules (tacrolimus capsules USP) containing the equivalent of 0.5 mg, 1 mg or 5 mg of anhydrous tacrolimus USP. Inactive ingredients include croscarmellose sodium NF, hypromellose USP, lactose monohydrate NF, and magnesium stearate NF. The 0.5 mg capsule shell contains, FD & C Blue 1, FD & C Red 40, gelatin NF and titanium dioxide USP, the 1 mg capsule shell contains FD & C Blue 1, gelatin NF, iron oxide yellow and titanium dioxide USP, and the 5 mg capsule shell contains D & C Red 28, D & C Yellow 10, FD & C Blue 1, gelatin NF, and titanium dioxide USP. structure-tacrolimus