This study investigated the ability of dilazep (comelian) to prevent clonidine induced aggressive behavior in mice. Mice administered high doses of clonidine (20-50 mg/kg i.p.) exhibited aggressive behavior in dose dependent manner. Dilazep (5-20 mg/kg i.p.) dose-dependently inhibited the aggressive behavior induced by clonidine (50 mg/kg i.p.). Dilazep (2mg/kg i.p.), adenosine (10mg/kg i.p.), dipyridamole (10 mg/kg i.p.) or N^6-cyclohexyl adenosine (CHA