Your healthcare provider should do blood tests before you start receiving XELJANZ/XELJANZ XR, and while you take XELJANZ/XELJANZ XR, to check for the following side effects:
- changes in lymphocyte counts. Lymphocytes are white blood cells that help the body fight off infections.
- low neutrophil counts. Neutrophils are white blood cells that help the body fight off infections.
- low red blood cell count. This may mean that you have anemia, which may make you feel weak and tired.
Your healthcare provider should routinely check certain liver tests.
You should not receive XELJANZ/XELJANZ XR if your lymphocyte count, neutrophil count, or red blood cell count is too low or your liver tests are too high. Your healthcare provider may stop your XELJANZ/XELJANZ XR treatment for a period of time if needed because of changes in these blood test results.
Your healthcare provider should do blood tests to check your cholesterol levels 4-8 weeks after you start XELJANZ/XELJANZ XR, and as needed after that.