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.

Synonyms: Contraceptive, Oral, Contraceptives, Low-Dose Oral, Oral Contraceptives, Low-Dose, Oral Contraceptive, Low-Dose, Low-Dose Oral Contraceptive, Phasic Oral Contraceptives, Low Dose Oral Contraceptive, 0, Contraceptives, Oral, Oral Contraceptives, Phasic, Low-Dose Oral Contraceptives, Oral Contraceptives, Low Dose, Contraceptives, Phasic Oral, Oral Contraceptive, Oral Contraceptives, Contraceptive, Low-Dose Oral