Pharmacological action:ipradol (hexoprenaline sulphate) is a beta2 -selective sympathomimetic agent which exhibits minimal cardiovascular side-effects, causes uterine muscle relaxation by synthesis of cyclic amp.indications:to prevent the onset of premature labour in high risk cases e.g.a)as a loading-dose to achieve a rapid blood level of the drug prior to an intravenous infusion, in the treatment of premature labour.b)to remove rapidly hypertonic uterine action which may occur with oxytocic drugs in the induction of labour.c)as a temporising measure in the treatment of foetal distress, before vaginal delivery (when imminent) or caesarean section.d)to rapidly stop contractions as a temporising measure before caesarean section, where there is a prolapsed cord, especially if the patient needs to be transported to hospital.e)as an aid when performing an external cephalic version in an irritable uterus.f)when oxytocic agents have inadvertently been given after bi