Sildenofil in Persistent Pulmonary Hypertension in Newborns

50 mg tablet will be thoroughly crushed into powder form and diluted in 10 ml ora base suspension syrup agent and a dilution will be performed to prepare 5 mg/ml. All doses required for 48 hours will be available; solutions will be stored at 2-8 degrees C where solution should be stable for at least a month.

The placebo will have an equal volume of diluent - Orabase syrup of the same colour and viscosity as the active comparator. Infants in this group will receive normal saline as placebo every 6 hours