All are tocolytics except
Misoprostol is indicated in cervical ripening prior to Labour whereas tocolytics inhibit uterine contractions and keep the uterus quiescent. Reference: Textbook of Obstetrics : Sheila Balakrishnan pg. 573,196
Ritodrine
Salbutamol
Isoxsuprine
Misoprostol
Abnormal labor