EEG observations during combined haloperidol-lithium treatment

Some reports have indicated a neurotoxic interaction of haloperidol and lithium, whereas others have not found this interaction. This is a report on two patients who showed both photomyoclonic and photoparoxysmal responses while on combined lithium-haloperidol treatment. We suggest that these findings, which have not been previously reported to be associated with combined lithium-haloperidol treatment, reflect neurotoxicity and that electroencephalogram (EEG) monitoring should be done on patients receiving this combined medication regimen.