Transcranial Magnetic Stimulation (TMS) is used to treat depression that has not responded to other therapies. It involves the use of rapidly alternating magnetic fields to stimulate specific areas of the brain. Unlike ECT, TMS does not cause a seizure and the patient remains awake through the noninvasive process. TMS typically only has mild side effects including headaches, muscle twitches and pain at the stimulation site. TMS is usually administered four or five times a week for four-to-six weeks.