Phentolamine is a non-selective alpha-1 and alpha-2 adrenergic antagonist designed to reduce pupil size by uniquely blocking the alpha-1 receptors found on the iris dilator muscle without ...

Cardioselective beta-blockers act on beta-1 more than beta-2 and thus will not trigger or worsen asthma as much as non-cardioselective beta-blockers. Carvedilol and labetalol are non-selective ...