Duphaston is dydrogesterone
, a progesterone
derivative that has the beneficial effect in implantation
of the fertilised ovum in patients with luteal phase defect.
It is advised to take the drug for ten days from day 15 to 25 of the cycle.
If pregnancy occurs the ovary starts producing progesterone to maitain the pregnancy. Duphaston is not required further.
If pregnancy does not occur duphaston does not interfere with menstruation