<qa>  What is the effect that plasmapheresis may have on removal of these medications?During the treatment phase with plasmapheresis patients also receive a number of other medications such as immunosuppressants for the prevention and treatment of graft rejection, antibiotics for prevention and treatment of infection and various other medications for related illnesses. The effects that plasmapheresis may have on removal of these medications is not known for many of these agents. This information would be helpful for the potential need to re-dose or give supplemental doses of medications. This is extremely important for the immunosuppressant medications since under-dosing of these agents may result in serious negative outcomes. Due to these many unknown aspects it would be useful to know the extent of drug removal during plasmapheresis treatments. This would enable more precise dosing and ultimately better patient care. 