Mirabegron is the first selective beta 3 adrenergic receptor agonist.
Its efficacy is similar to that of anticholinergic drugs. There is a high response to placebo. The absolute improvement with mirabegron is very small and clinically irrelevant.
It produces less dry mouth syndrome than tolterodine but there are no differences in treatment withdrawal due to adverse effects. Tachycardia and urinary infections are the most frequent adverse effects. Its long-term safety profile is unknown.