Although catatonia has been previously associated with schizophrenia, today it is more associated with mood disorders and general medical conditions. Periodic catatonia is a rare type of catatonic syndrome having frequently and constantly repeated catatonic episodes. In the pathogenesis of catatonia several mechanisms have been suggested. Benzodiazepines and electroconvulsive therapy (ECT) have been used as first line treatment in catatonia. We report about the case of a patient successfully treated with maintenance ECT in periodic catatonia.