This invention relates to sustained release dosage forms comprising {1-{1-[3-fluoro-2-(trifluoromethyl)isonicotinoyl]piperidin-4-yl}-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]azetidin-3-yl}acetonitrile, or a pharmaceutically acceptable salt thereof, and doses and methods related thereto.本發明係關於包含{1-{1-[3-氟-2-(三氟甲基)異菸鹼醯基]哌啶-4-基}-3-[4-(7H-吡咯并[2,3-d]嘧啶-4-基)-1H-吡唑-1-基]氮雜環丁烷-3-基}乙腈或其醫藥學上可接受之鹽之持續釋放劑型以及與其相關之劑量及方法。