Abstract: Fetal growth restriction (FGR), is a condition where an unborn baby (fetus), is smaller than what is expected for the number weeks of pregnancy (gestational year). This is usually described as a weight that is less than the 10th per centile. It is a baby whose estimated weight is less than the 10th percentile. An AFI that shows a fluid level less than 5 cm (or the 5th percentile) or a lack of fluid pockets 2-3 cm in depth at 32-36-week gestation would indicate oligohydramnios. It vasodilates myometrial arteries, and increases the amniotic fluid quantity. To provide a comprehensive description of sildenafil Citrates use in iugr or oligohydramnios, we reviewed the numerous literature sources.