Raymond Hang Wun Li , Sue Seen Tsing Lo , Sharon Tracey Cameron
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The World Health Organization includes oral emergency contraception (EC) in the list of essential medicines. Ulipristal acetate (UPA) and levonorgestrel (LNG) are the recommended oral methods. UPA has superior efficacy and a comparable side effect profile compared with LNG. Both work by inhibiting or delaying ovulation, so that sperm present in the reproductive tract will have lost their fertilising ability by the time the oocyte is eventually released. Neither LNG nor UPA at the EC doses have significant effects on the endometrium and are unable to prevent implantation. Mifepristone can also be used for EC but its availability is limited to few countries. LNG is less effective in women with a body mass index over 26 kg/m2 or weight over 70 kg. Hormonal contraception can be quickstarted immediately following LNG, or five days following UPA. LNG-releasing intrauterine devices and cyclo-oxygenase inhibitors are promising options for EC to be further studied.
期刊介绍：
In practical paperback format, each 200 page topic-based issue of Best Practice & Research Clinical Obstetrics & Gynaecology will provide a comprehensive review of current clinical practice and thinking within the specialties of obstetrics and gynaecology.
All chapters take the form of practical, evidence-based reviews that seek to address key clinical issues of diagnosis, treatment and patient management.
Each issue follows a problem-orientated approach that focuses on the key questions to be addressed, clearly defining what is known and not known. Management will be described in practical terms so that it can be applied to the individual patient.
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