I'm 72 Years Old And Had A Radical Retropubic Prostatectomy

I'm 72 years old and had a radical retropubic prostatectomy 8 years ago due to prostate cancer. I have had for many years, maybe 30 or so, urinary frequency. My brother takes Rapaflo and tells me that it makes him pee like a race horse. I'm wondering if it would work for me by relaxing my bladder.