Why does my cancer medicine make me urinate more?

Dear Erwin — Yes, me too. I pee and 10 minutes later I feel I have to pee again. My urologist prescribed mirabegron. For me, it’s been slightly effective at best, and it’s expensive. (I use Good Rx coupons; cheaper than using my Medicare Part D insurance coverage). But look into it; you may want to give it a try.