beta-Adrenergic blocking agents--esmolol hydrochloride, pharmacokinetic profile, metabolism. Pharmacokinetic profile--cardioselective beta-adrenergic blocking agent, methyl 3-[4-(2-hydroxy-3-(isopropylamino)propoxy]phenylpropionate hydrochloride. Esmolol--cardioselective beta-adrenergic blocking agent, pharmacokinetic profile.