 Likewise, an intramuscular injection of 100 mg dydrogesterone in microcrystalline aqueous suspension on the first to third day of the cycle did not interfere with the development of an ovulatory pattern of spontaneous uterine contractions in women.A couple of conflicting studies exist on the issue of ovulation inhibition by dydrogesterone however, with findings of partial or full inhibition of ovulation by oral dydrogesterone.This included prevention of the mid-cycle LH and FSH peaks and the luteal-phase rise in body temperature and pregnanediol excretion.