All of the following agents are are tocolytics, EXCEPT:
Among the above given options, Misoprostol is not a tocolytic. It is a methyl ester of PGE1 which has been used for cervical ripening and induction of labour. Ref: Who Model Formulary 2008 By Mark C. Stua, Maria Kouimtzi, World Health Organization, Suzanne R. Hill, Pages 450-51; Dutta textbook of Obstetrics 6th edition, Pages 175, 505 and 507-508
Ritodrine
Salbutamol
Isoxsuprine
Misoprostol