We have started a study using a remote electronic Medication Event Monitoring System (MEMS) device to measure medication adherence (taking your medication as directed). The MEMS device is a cap on a medicine bottle that notes the day and time when the cap has been removed and put back on the bottle. If you will be starting or have recently started Xeljanz (tofacitinib) within the past 3 months and would like to know more, please contact us by email at info@ndb.org or by calling 1-800-323-5871 ext. 143 or 119.