Pretty common. Most side effects also become cumulative to where if they become intolerable (only the patient can evaluate that) 1/2, 1/3, 1/4 even 1/10 dosages are used.
DX 5/6/2008 TAG3 papillary tumor .5 CM in size. 2 TURBS followed by 6 instillations of BCG weekly with a second round of 6 after a 6 week wait.