Species chosen for β3-AR expression: dominant in human and monkey bladder; rats express β3 and β2; mice and rabbits only β2
“β3 AR is the dominant receptor in bladder smooth muscle in humans and monkeys. β3 and β2 receptor subtypes are expressed in rats. β2 receptors only are expressed in mice and rabbits.”
FDA: adequately evaluated; selective β3-AR agonist shown to relax detrusor and increase bladder capacity
“Vibegron has been adequately evaluated in nonclinical studies for pharmacology, pharmacokinetics and toxicology. Studies showed that vibegron is a selective agonist for the β-3 AR over β-1 and β-2 AR and demonstrated its intended pharmacologic function of relaxing the detrusor smooth muscle of the urinary bladder during bladder filling to increase bladder capacity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 5Source ↗