Increased paroxysmal activity of partial seizures in man by apomorphine.

In order to study the role of dopamine (DA) in the regulation of seizure mechanisms in man, a non-emetic dose of apomorphine, a direct stimulant of DA receptors, was administered to eight patients effected by different types of epilepsy. The EEG changes induced by apomorphine administration in comparison to those elicited by promazine or placebo were evaluated in a double blind cross-over study. Similarly to promazine treatment, apomorphine worsened the EEG recordings of some patients. The apomorphine-induced increase in paroxysmal activity was observed in patients affected by partial epilepsy and was not related to the sleep-inducing properties of the drug. This effect is interpreted as being the result of a stimulation of DA autoreceptors, mediating a decrease of dopaminergic activity in the central nervous system. The use of apomorphine as an EEG activating agent is suggested.