Bladder Botox

Hi, i was wondering if anyone has experience of this treatment for urinary incontinence? It’s been proposed for a family member (c 30 years after PD diagnosis at age 40) if dual drug treatment doesn’t help - mirabegron & solfenacin - and our experience is that the drugs don’t seem to be effective after some encouraging early results. We’ve been warned that botox runs a risk of being too effective, which would be a similar nightmare, but, as I said it’d be interesting to know of anyone here who had been through it/know of others who have.