Mirabegron
"Amazing. Had OAB for 22 years. Bladder Myomectomy 18 years ago made life sort of possible but  frequency has become worse in recent years. Was given mirabgron last week. After one tablet I slept through the night for the first time in over 20 years. Been on it for 5 days now - bladder pressure and discomfort greatly eased and have sometimes gone 5 hours without a pee but regulary manage 3 hours. Before I could not go more that 90 mins- 2hrs without discomfort or going for a pee. So looking good. No side effects noticed yet either. As I live in Wales there is no charge for prescription."