- Study Drug (meloxicam or placebo): If the participant takes part in this research study, the participant will be given a study drug-dosing diary. The study drug will come as a pill that the participant will take by mouth daily for 5 days, starting 6 days (Day -6) before the participant is scheduled to undergo the first apheresis procedure (Day 0) and continuing until 2 days before apheresis (Day -2). The participant will take meloxicam or placebo for a total of 5 days. The diary will also include special instructions for taking the study drug(s).