contraceptive drug oral contraceptive http://purl.bioontology.org/ontology/MEDDRA/10030971 http://purl.obolibrary.org/obo/CHEBI_49325 http://purl.obolibrary.org/obo/NCIT_C389 A compound, usually hormonal, taken orally in order to block ovulation and prevent the occurrence of pregnancy. An agent taken orally to prevent conception. OC contraceptive oral pill oral contraceptive pill oral contraceptives oral route of administration The Complete Dictionary of Sexology