Your urologist or regular doctor will have to write a prescript
ion. There are now two dosages, one is 12 hour and the other is 36 hour. I always used to take the 36 hour dose which did work as advertised. My doctor also prescribed the largest dose which I then cut the pills in half. My insurance would only pay for 5 pills a month.
I did have a weird side effect, after being on the drug for about 12 hours. I would get leg cramps which went away as the drug wore off.