Mirabegron
"I have been taking this medication for a month now and have noticed a big difference in the amount of times I go to the bathroom.  It is great, but like with all the other medications you must watch the amount of caffeine you intake because it doesn't work as well.  Caffeine will relax the muscle, but if I drink water or anything caffeine free I am fine. I can drink up to 3-4 glasses and still be ok. It worked better than all the others I've been put on."