Refers to extended release dosage forms comprising {1 - {[1 - 3 - fluoro - 2 - (trifluoromethyl) isonicotinoil piperidin-4-yl il}] - 3 - [4 - (7H pyrrolo [2,3-d] pyrimidin-4-yl) - 1H pyrazole - 1 - il azetidin il}] - 3 - (acetonitrile itacitinib) or a pharmaceutically acceptable Salt thereof, useful in the TR Attachment of myeloproliferative disorders, autoimmune diseases,Inflammatory diseases, Diseases of bone resorption or rejection of an organ transplant in a patient in need.Se refiere a formas de dosificacion de liberacion prolongada que comprenden {1-{1-[3-fluoro-2-(trifluorometil)isonicotinoil]piperidin-4-il}-3-[4-(7H-pirrolo[2,3-d]pirimidin-4-il)-1H-pirazol-1-il]azetidin-3-il}acetonitrilo (ITACITINIB) o una sal farmaceuticamente aceptable del mismo, utiles en el tratamiento de enfermedades autoinmunitarias, trastornos mieloproliferativos, enfermedades inflamatorias, enfermedades de resorcion osea o rechazo a un transplante de organo en un paciente que lo necesita.