I can only speak of my personal experience. I had #10 of my treatments yesterday (6X, 3X, and 1st of my next three maintenance) and the only side effects I have experienced during the entire process was bleeding for about 24 hrs. when I urinated after #8 & #9 and a slight burning/inflamed feeling internally. Very little blood in urine for about 3 hr. from yesterday's treatment. I was telling the wife that I actually am feeling very good today. My Doc showed me on the monitor where the BCG was working after my initial 6X during the cystoscopy. On my cysto last week my bladder only looked inflamed. So far so good with no recurrence.
Good Luck!
08/16 Blood in Urine;09/16 CT Scan, RPG, Cysto;10/16 TURBT;12/08 BL TURBT;01/17 6X BCG;05/17 NED, 3X BCG, 9/17 NED, 3X BCG,1/18 NED, 3X BCG,7/18 NED, 3X BCG