Xeljanz is an oral drug used to treat adults with moderately to severely active RA (Rheumatoid Arthritis). It works in order to block the body’s formation of enzymes known as Janus kinases (JAKs). Some common side effects of Xeljanz are headache, runny/stuffy nose, feeling sick and joint pain. Xeljanz is used alone or in combination with other medications and it may take around 3-6 weeks for improvement. xeljanz cost is estimated to be around ₹1105.73/Tablet.