Oral hormonal contraceptives have been available since the early 1960s when Pincus and Rock found that norethynodrel (9.65 mg) in combination with mestranol (150 μg) inhibited ovulation and provided sufficient control of the menstrual cycle. Since then, different approaches to contraception have been pursued. Hormonal steroids can either act as ovulation inhibitors or prevent conception by altering the cervical mucus.
KeywordsMenstrual Cycle Oral Contraceptive Contraceptive Method Hormonal Contraception Vaginal Ring
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