ECT is a form of treatment in which controlled electric currents are passed through the brain, sometimes causing short seizures. Treatments are done under general anesthesia. ECT appears to change brain chemistry for the better, and has been shown to provide fast and sometimes dramatic improvements in severe mental health conditions that can exist alongside addiction, including depression, bipolar disorder, psychosis, and suicidality. ECT is also often used by those who prefer it to taking medication.