You are about to receive medication into your bladder. This is done by inserting a catheter into the opening of the urethra, then into the bladder. When the catheter is in the bladder, medication (BCG) will be passed through the catheter into the bladder. This is called a bladder instillation. You will receive your BCG treatment via this method. The usual course of treatment is once a week for six weeks. Treatment may be postponed depending on urinalysis.