Your family doctor will ask you to empty your bladder completely before the solution is instilled into it.
Follow your family doctor's instructions carefully about how long to hold the solution in your bladder :
It is important that you drink extra fluids for few hours after each treat with BCG so that you will pass more urine. Always empty your bladder frequently. This will help prevent bladder problems.
BCG is a live product. In other words, it contains active bacteria that can cause infection. Some bacteria will be present for few hours in urine that you pass after each treat with BCG. Any urine that you pass during the first 6 hours after each treat must be disinfected with an equal amount - usually about 1 cup of undiluted household bleach. After the bleach is added to the urine, it must be allowed to sit for 15 minutes before it is flushed. If you have any questions about this, check with your family doctor.