in vivo ed50 's against isoprenaline tachycardia ( beta 1 ) and vasodilation ( beta 2 ) in anesthetized cats were 5.7 x 10 ( -8 ) and 6.2 x 10 ( -8 ) mol/kg , i.v. , respectively .
C0022245
isoprenaline
C0039231
tachycardia