<prompt> Mirabegron is a:Beta 3 agonistBeta 3 antagonistBeta 1 agonistBeta 1 antagonist  <response>: Mirabegron is a beta 3 agonist. It is indicated in overactive bladder because Beta 3 receptor stimulation relaxes the bladder. Beta 3 receptor are also present on adipose tissue and cause lipolysis. So, beta 3 agonist can be used as anti-obesity drugs but are not approved yet. 