Contraceptives, Oral. Oral Contraceptives . Oral Contraceptives, Low-Dose . Oral Contraceptives, Phasic . Contraceptives, Low-Dose Oral . Contraceptives, Phasic Oral . Low-Dose Oral Contraceptives . Oral Contraceptives, Low Dose . Phasic Oral Contraceptives . Compounds, usually hormonal, taken orally in order to block ovulation and prevent the occurrence of pregnancy. The hormones are generally estrogen or progesterone or both. . 0.69