mirabegron

noun

mir·​a·​beg·​ron ˌmir-ə-ˈbeg-ˌrän 

: a beta-agonist C₂₁H₂₄N₄O₂S that relaxes the detrusor musculature of the bladder and is taken orally to treat the symptoms (such as urinary incontinence and urgency) associated with an overactive bladder

Note: Mirabegron is marketed under the trademark Myrbetriq.