This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
A woman at 32 weeks of pregnancy, presents with labour pains. On examination, her cervix is 2 cm dilated and one uterine contraction is felt every 20 - 30 seconds. The management is :- 
Select and explain. 
A. Isoxsuprine hydrochloride, B. Wait and watch, C. Augmentation of labour, D. Emergency LSCS
A: Isoxsuprine hydrochloride
Answer: A: Isoxsuprine hydrochloride 
Explanation: The patient here is in early preterm labour Isoxsuprine hydrochlorine is a b agonist which acts as a tocolytic by reducing intracellular ionized calcium levels and prevent activation of myometrial contractile proteins. Tocolytics can be used to cause delay in delivery for up to 48 hours , allowing transpo mother with fetus in utero to a center with higher level of neonatal care and permit time for coicosteroid to act Tocolytic agents Beta agonists: Ritodrine, Isoxsuprine Calcium channel blockers: Nifedipine Calcium antagonists: MgSO4 Oxytocin antagonist: atosiban Progesterone NO (nitrous oxide) donor: NTG patck