Jaknat 5mg (Tofacitinib) is used to treat certain types of arthritis(such as psoriatic arthritis, rheumatoid arthritis, polyarticular coursejuvenile idiopathic arthritis-pcJIA). It helps to decreasepain/tenderness/swelling in the joints. Tofacitinib is also used to treat acertain bowel disease (ulcerative colitis). It helps to reduce symptoms ofulcerative colitis such as diarrhea, rectal bleeding, and stomach pain.