The most commonly reported side effects during clinical trials were headache and scalp discomfort. These potential side effects were typically mild to moderate, and were less common after the first week of treatment. During clinical trials, less than 5% of patients treated with TMS discontinued treatment due to side effects. If necessary, headaches from TMS can be treated with over-the-counter pain medications. If the side effects persist, the strength of the TMS pulses can be temporarily reduced to ensure the comfort of the patient.