title: Developments and challenges in emergency contraception.
abstract: Emergency contraception (EC) methods, available in oral and intra-uterine forms, seek to prevent pregnancy after unprotected intercourse or contraceptive failure. Levonorgestrel EC is more effective and has fewer side effects than the previously used combined oral hormonal method; the Yuzpe regimen. In recent years, levonorgestrel has increased in use, and has become available over the counter in pharmacies in many countries. Compared with oral methods, the copper intra-uterine device offers greater protection against unplanned pregnancy but requires a clinical consultation. The much hoped for potential of EC methods to reduce unintended pregnancy is yet to be demonstrated at population level.
authors.affiliation: Department of Obstetrics and Gynaecology, University of Sydney, Sydney 2006, NSW, Australia. kblack@med.usyd.edu.au
authors.forename: Kirsten I
authors.initials: KI
authors.lastname: Black
mesh_terms: D044363:Contraception, Postcoital / Q000379:methods*; D003271:Contraceptive Agents, Female / Q000008:administration & dosage / Q000600:supply & distribution; D003281:Contraceptives, Postcoital / Q000008:administration & dosage* / Q000600:supply & distribution; D003376:Counseling; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D007434:Intrauterine Devices; D016912:Levonorgestrel / Q000008:administration & dosage; D013997:Time Factors
chemical_list: D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital; D016912:Levonorgestrel