How long does intravesical BCG therapy take to work for bladder cancer?

BCG is placed directly into the bladder through a catheter. It stimulates a local immune response intended to reduce the chance that certain bladder cancers persist or return. The treatment is not expected to give an instant visible result, and urinary irritation can occur soon after an instillation.

Your urology team may examine the bladder after the initial course and use the findings to plan further treatment or surveillance. A clear result depends on what the cystoscopy shows, urine findings, the tumour’s features and how well you tolerated the instillations.

Follow the clinic’s instructions about preparing for each instillation, holding the medicine in the bladder and safely passing urine afterwards. Drink according to the instructions you receive and record burning, urgency, blood in the urine or fever between visits.

Tell the team before an appointment if you feel unwell, cannot pass urine, have a urinary infection, or have had a recent bladder procedure. They may need to delay an instillation while the bladder settles.

Seek prompt medical advice for a high temperature, chills, worsening flu-like illness, confusion, severe weakness, heavy bleeding, inability to pass urine or severe pain after BCG. These symptoms need assessment rather than being treated as ordinary bladder irritation.

Ask when your first bladder check is planned, how urine results affect the plan, and which symptoms should make you skip or delay an instillation. Ask what to do if burning or urgency continues between appointments.