The pill’s first approval was for menstrual disorders
In 1957, the U.S. Food and Drug Administration approved Enovid, the drug that would become the first widely used birth control pill, to treat menstrual disorders—not to prevent pregnancy. That distinction was built into the approval: the agency authorized doctors to prescribe it for a medical condition, while its contraceptive use remained unapproved.
Enovid contained synthetic versions of two hormones involved in the menstrual cycle: estrogen and progestin. In the right combination, these hormones can prevent ovulation—the release of an egg from the ovary. Without an egg, fertilization cannot occur. The same hormonal action that made the drug useful for contraception could also affect menstrual symptoms, giving its developers a medical indication under which it could first reach patients.
How the label shaped its early use
A drug’s approved purpose matters because it determines what doctors can formally prescribe it to treat. Enovid’s 1957 approval therefore did not amount to official approval as birth control, even though the pill’s pregnancy-prevention effect was central to its development. The gap between the drug’s practical effect and its authorized use let contraception enter medical practice under the more acceptable public label of treating menstrual problems.
In 1960, the FDA approved Enovid specifically as a contraceptive. The change made explicit what the earlier approval had left unstated: a medicine first authorized for menstrual disorders could also be prescribed to prevent pregnancy.
