The first pills...

The first birth control pills came into use in the 1950s, following the discovery that was made on the influence that certain hormones have on the menstrual cycle. After a period of testing, in 1961 the first oral contraceptive marketed in history, based on the action of estrogen and progesterone, as the primary mechanism to prevent ovulation, change the uterine lining and cervical mucus. Since then, the combinations of hormones as well as graduation, have been modified for high effectiveness, no side effects of direct impact on the health of women undergoing treatment.