My mother ( 88yrS)has just been discharged after undergoing a pacemaker implant procedure. The blood test indicate mild anisocytosis and are predominantly normochromic and normocytic. she is presently on Flovite MB (floic acid) and A-Z multivitamin, prescribed for her stomatitis of the mouth which persisiting despite having stopped the antibiotic 8 days ago. Is this the side effects of Antibiotic taken for 20 days 500mg per day or something else ?