Background: Hypertension is the most common medical problem encountered in pregnancy and remains an important cause of maternal, and fetal, morbidity and mortality. It complicates up to15% of pregnant mothers and accounts for approximately a quarter of all antenatal admissions. The hypertensive disorders of pregnancy cover a spectrum of conditions, of which pre eclampsia poses the greatest potential risk and remains one of the most common causes of maternal death in the UK. The aim of the study is to examine the nurses/nurse midwives knowledge regarding Magnesium Sulfate administration to pre-eclamptic /eclamptic mothers. Materials and Methods, study design is a descriptive-cross sectional hospital based study, at