Yale School of Medicine produced the first proof-of-concept study on the viability of a "morning-after" pill for human use. This study was a result of a fruitful collaboration between a pair of Yale scientists, Drs. John M. Morris and Gertrude van Wagenen, who sought a non-abortion, post-coital contraceptive. They tested a variety of hormones, hormone-based synthetic drugs, and other compounds in monkeys in an effort to uncover a compound that was non-toxic but highly effective. Unfortunately, although they were unable to identify such a drug, their initial studies inspired other scientists to further pursue the concept of a "morning-after" pill, leading to the development of Food and Drug Administration (FDA)-approved emergency contraceptives.
Keywords: "morning-after" pill; diethylstilbestrol; emergency contraception; estrogenic compounds; ethinyl estradiol.