Tofacitinib citrate, chemically named as (3R,4R)-3-[4-methyl-3-[N-methyl-N-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino]piperidin-1-yl]-3-oxopropionitrile citrate, is a white or almost white powder, which is lightly soluble in water, very slightly soluble in methanol, and practically insoluble in acetone.