Aim. The aim of the study was to assess efficacy and safety of electroconvulsive therapy. Methods. 43 patients included into the study were hospitalised in The Institute of Psychiatry and Neurology and received all together over 400 bilateral electroconvulsive procedures. Most of the patients (N=25) were qualified for electroconvulsive therapy due to treatment resistant depression (58.1%). Six patients: 2 with catatonia and 4 with depression had life saving indications for electroconvulsive therapy. Three patients (7%) were excluded from electroconvulsive therapy, following 1 or 2 electroconvulsive procedures. Forty patients continued electroconvulsive therapy. Results. There were no complications and serious adverse events in patients who continued electroconvulsive therapy. Generally, electroconvulsive therapy was well tolerated and treatment had been cut down in only one case due to adverse events and high risk related to the procedure. Transient cardiac arrhythmias (10% of patients) were the most often occurring adverse events and patients (35%) mostly reported headaches. We observed remission in 22 patients (58%) and improvement in 14 patients (35%) following electroconvulsive treatment. Only 4 patients (10%) had no benefit after a series of electroconvulsive procedures. Electroconvulsive treatment was most effective in patients with catatonia (80% patients had full recovery) and in depressive patients with bipolar disorder (73% patients had full recovery). Conclusion. Electroconvulsive procedures were safe and effective. Electroconvulsive treatment was most effective in catatonic patients with schizophrenia and in depressive patients with bipolar disorder.