at higher concentrations all the alpha- and beta-antagonists studied depressed the neurogenic twitches and relaxed the smooth muscle.4 the twitch-inhibitory effects of adrenoceptor agonists ( noradrenaline , adrenaline and ephedrine ) were not antagonized by phenoxybenzamine ( 0.1 , 0.5 and 1 mum ) , carbidine ( 0.5 , 1 and 5 mum ) and propranolol ( 0.5 , 1 and 5 mum ) ;
C0028351
noradrenaline
C0014563
adrenaline