any harm doing internal cleansing while on high dose of prednisone? how to coordinate

my wife was recently diagnosed with Churg-Strauss Syndrome (vasculitis).  We are hoping this might be an error.  Nonetheless, as the standard method of treatment is the use of steroids, she is on daily dose of 60 mg.  Undoubtedly this can become toxic, at least by now and wish to curtail some of the negative effects by going through some internal cleansing using one of myriad herbal " programs".  We are careful to ingest good foods consistent with the situation but believe her system could use the extra attention this way. Have looked at a milder form (ie. for the beginner "cleansee") but worry about how it might interfere with the prednisone and its beneficial, albeit overpowering, effects.  Anyone with experience, opinions?