What are the dangers of treating bladder incontinence with botox injections?

Retention, UTI. Botox is used to treat severe urge incontinence (overactive bladder). It is injected thru a cystoscope (thin telescope) into the detrusor (bladder) muscle. Botox partially paralyzes spastic bladder muscle, there can be a period of temporary urinary retention or trouble emptying the bladder requiring catheterization, typically for a week. Utis may occur during this period.
Urinary retention. Done well, the risks are minimal. But overtreatment can lead to urinary retention. Infection, trauma to the uretrha, blood in the urine are all possible.