122 E Wabash Avenue Forrest, IL 61741 Appointments- Mon, Tue, Wed, Fri: 8am - 5pm Office hours-Mon-Fri: 8am - 5pm (815) 657-8707 (815) 657-8717. Benjamin Brewer, MD Family Practice, Maternity Care, Obstetrics Gibson City Clinic, Gibson Health of Onarga, Prairie Family Medicine & Obstetrics..