SPL Set ID: 4b310c6b-e035-4e44-9573-4001d58b2ad5

Tacrolimus, USP previously known as FK506, is the active ingredient in Tacrolimus Capsules, USP. Tacrolimus, USP is a calcineurin-inhibitor immunosuppressant produced by Streptomyces tsukubaensis . Chemically, tacrolimus, USP is designated as (-)-(3 S ,4 R ,5 S ,8 R ,9 E ,12 S ,14 S ,15 R ,16 S ,18 R ,19 R ,26a S )-8-Allyl-5,6,8,11,12,13,14,15,16,17,18,19,24,25,26,26a-hexadecahydro-5,19-dihydroxy-3-[( E )-2-[(1 R ,3 R ,4 R )-4-hydroxy-3-methoxy cyclohexyl]-1-methylvinyl]-14,16-dimethoxy-4,10,12,18-tetramethyl-15,19-epoxy-3 H -pyrido[2,1-c][1,4]oxaazacyclotricosine-1,7,20,21(4 H ,23 H )-tetrone,monohydrate. The chemical structure of tacrolimus, USP is: Tacrolimus, USP has an empirical formula of C 44 H 69 NO 12 •H 2 O and a formula weight of 822.03 g/mol. Tacrolimus, USP appears as white to off-white powder. It is soluble in acetone, chloroform and ethyl acetate; insoluble in water. Tacrolimus Capsules, USP are 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 croscarmellose sodium, hypromellose, lactose monohydrate, and magnesium stearate. The 0.5 mg capsule shell contains D&C Yellow 10, FD&C Red 40, FD&C Blue 1, gelatin, shellac, sodium hydroxide, povidone and titanium dioxide. The 1 mg capsule shell contains FD&C Red 40, gelatin, shellac, sodium hydroxide, povidone and titanium dioxide. The 5 mg capsule shell contains gelatin, D&C Yellow 10, FD&C Blue 1, FD&C Red 40, potassium hydroxide, shellac and titanium dioxide. FDA approved dissolution test specifications differ from USP. image-01.jpg