Bladder cancer is mostly treated with transurethral bladder infusion chemotherapy drugs, commonly used drugs include: 1. BCG vaccine, which can effectively reduce the recurrence rate of bladder cancer and reduce the malignancy of bladder cancer after recurrence, but there are fewer manufacturers, more difficult to purchase, expensive, and oral anti-tuberculosis drugs are required before infusion to prevent tuberculosis infection during infusion. 2. Gemcitabine, currently recommended by urology guidelines It is recommended in urology guidelines to use gemcitabine for bladder perfusion chemotherapy, which effectively reduces the recurrence rate of bladder cancer and is relatively well tolerated by tissues and patients have less urinary tract irritation.3. Epirubicin, which can also greatly reduce the recurrence rate of bladder cancer, but has heavy local irritation symptoms and cannot be kept for a long time for perfusion. 4. mitomycin, which is also effective in reducing the recurrence rate of bladder cancer and has less irritation after instillation, is less available from fewer manufacturers and more difficult to purchase.