One thousand women of child bearing age were given, within 72 hours of sexual exposure, 25 mg of diethylstilbestrol twice daily for five days. No pregnancies resulted and there were no serious adverse reactions. It was emphasized to the patient that this was an emergency type of treatment and, should she have a continuing need for contraception, other means should be sought.
Kuchera LK. Postcoital Contraception With Diethylstilbestrol. JAMA. 1971;218(4):562-563. doi:10.1001/jama.1971.03190170040008