Greenbrook’s St. Peters center is St.Peters's most-trusted provider for TMS (Transcranial Magnetic Stimulation) therapy and nasal esketamine. TMS therapy is FDA-cleared for the treatment of depression and Obsessive-Compulsive Disorder (OCD). Nasal esketamine is the only FDA-approved ketamine-based treatment for depression. Both TMS therapy and nasal esketamine are available for you at our St. Peters center and covered by most insurance in St. Charles and throughout Missouri.