Naloxone-induced epileptogenesis has brain-site specificity in rats.

Naloxone injected into the lateral septum caused intense electrocortical seizures which did not occur following callosal or periaqueductal gray (PAG) injections. Conversely, injections into periaqueductal gray caused a characteristic and pronounced backward circling with only moderate electrocortical changes. Intracerebral injection of naloxone had effects, including epileptogenesis, which appeared to be site-specific. These effects are in some ways similar to the effects of enkephalin and morphine.