That is why we decided to study the role of Sildenafil Citrate in expectant and conservative management of mild pre-eclampsia, as it has shown its ability to be beneficial to both the mother and the fetus through increasing the maternofetal circulation perfusion and achieving a maternal hemodynamic stability and compare it to the current NICE (National Institute for Health and Care Excellence) guidelines that are currently used, that recommends conservative management of mild pre-eclampsia through control of maternal blood pressure and frequent screening of maternal laboratory investigations' abnormalities to detect possible progression to severe pre-eclamptic toxemia.