Methylergometrine produces non-physiological spasmodic contraction of the uterus in moderate to high doses and the uterus does’nt fully relax between the contractions. It also causes contraction of the lower segment of uterus. So the delivery of the fetus can be affected.
It is used after the delivery of the shoulder of the infant to reduce post partum hemorrhage. But it is indicated only in cases which have a higher risk of post partum hemorrhage.