Hi soone. As Ashley mentioned, everyone's experience with treatments is individual. The major difference between Enbrel and Xeljanz is that the former is a biologic, while Xeljanz is a JAK inhibitor. They both act on the immune system in a similar manor, but have different mechanisms to do so and the JAK inhibitors do not use living biologic material (this is why they can be in a pill form). It may be worth asking your doctor why they are interested in this particular drug and also to voice your concerns. I can tell you that my wife, Kelly Mack (a contributor here), went from Enbril to Humira to Xeljanz and did not have a positive experience with Xeljanz from either a disease control of side effect perspective (predominantly headaches and gastrointestinal issues). That said, we know others who have used Xeljanz successfully for years. Hoping you get some relief from what ever treatment you chose and please feel free to keep us posted on how you are doing. Best, Richard (RheumatoidArthritis.net Team)