- Systemic administration of atipamezole, a selective antagonist of alpha-2 adrenoceptors, facilitates behavioural activity but does not influence short-term or long-term memory in trimethyltin-intoxicated and control rats. Niittykoski, M., Lappalainen, R., Jolkkonen, J., Haapalinna, A., Riekkinen, P., Sirviö, J. Neuroscience and biobehavioral reviews. (1998)