title: Emergency contraception.
abstract: The term 'emergency contraception', as employed in this paper, refers to methods that are used as emergency procedures to prevent pregnancy following unprotected intercourse. Alternative, less appropriate, terms are postcoital and 'morning-after' contraception. References to postcoital preparations can be found as far back as 1500 BC in Egyptian papyri, but it was not until fairly recently that contraceptive research has been able to at least partially fulfill that need. The development of hormonal methods of emergency contraception goes back to the 1960s when the first human trials of postcoitally administered high-dose oestrogens were undertaken. Combined oestrogen- progestogen combination therapy (the so-called Yuzpe regimen) was introduced in the early 1970s, while the postcoital insertion of an intrauterine contraceptive device (IUD) for emergency contraception was first reported in 1976. Other compounds that have been tested more recently include levonorgestrel, the antiprogestogen mifepristone, and danazol. Although there is some debate about the magnitude of the protective effect, few people question the important role that emergency contraception can play in preventing unwanted pregnancy and hence maternal mortality and morbidity resulting from unsafe abortion. Given that the most often used methods of emergency contraception, namely the Yuzpe regimen and postcoital insertion of an IUD, rely on technology that has been available for some 30 years, family planning programmes that claim to be concerned with improving women's reproductive health, cannot really be excused if they do not provide emergency contraception as part of their routine services.
authors.affiliation: Special Programme of Research, World Health Organization, Geneva, Switzerland.
authors.forename: P F
authors.initials: PF
authors.lastname: Van Look
authors.forename: H
authors.initials: H
authors.lastname: von Hertzen
mesh_terms: D003267:Contraception / Q000379:methods* / Q000639:trends; D003281:Contraceptives, Postcoital / Q000008:administration & dosage; D005260:Female; D005544:Forecasting; D006801:Humans; D007434:Intrauterine Devices; D011247:Pregnancy; D011275:Pregnancy, Unwanted
chemical_list: D003281:Contraceptives, Postcoital