“ Cocaine differentially potentiated the effects of the sympathomimetic amines … agonist potency was changed from xylazine greater than (-)-adrenaline greater than (+)-noradrenaline greater than (-)-metaraminol greater than or equal to (-)-noradrenaline greater than or equal … greater than (-)-noradrenaline greater than (-)-metaraminol greater than dopamine greater than or equal to (+)-noradrenaline.”