DSM-IV psychotic disorder;

drug or alcohol abuse or dependence (preceding 12 months);

inadequate response to ECT (current episode of depression);

anticonvulsant or benzodiazepine medication;

rapid clinical response required, e.g. high suicide risk; clinically defined neurological disorder or insult;

metal in the cranium, skull defects, or skin lesions on scalp (cuts, abrasions, rash) at proposed electrode sites;

pregnancy.

Transcranial Electrical Stimulation (TES) for the Treatment of Depression.