Emergency contraception (EC), or emergency postcoital contraception, are birth control measures that may be used after sexual intercourse to prevent pregnancy.
Forms of EC include:
Emergency contraceptive pills (ECPs)—sometimes simply referred to as emergency contraceptives (ECs) or the "morning-after pill"—are drugs intended to disrupt or delay ovulation or fertilization, which are necessary for pregnancy (contraceptives). ECPs and "abortion pills" are not the same. ECPs work by preventing or delaying ovulation and therefore preventing pregnancy, not by abortion.
Intrauterine devices (IUDs)—usually used as a primary contraceptive method, but sometimes used as emergency contraception.
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http://www.aafp.org/afp/2014/0401/p545.html an update on emergency contraception by michele c. Bosworth, md; patti l. Olusola, md; and sarah b. Low, md, university of texas health science center at tyler, tyler, texas am fam physician. 2014 apr 1;89(7):545-550.
http://njcmindia.org/uploads/5-4_414-418.pdf chavan gm, waghachavare vb, chavan ms,chavan vm, gore ad,dhumale gb. A study of knowledge, attitudes and practices regarding contraceptive services among health workers in sangli district of maharashtra, india. Natl j community med 2014: 5(4);414-8
http://europepmc.org/backend/ptpmcrender.fcgi?accid=pmc4186851&blobtype=pdf dawson a, tran n-t, westley e, mangiaterra v, festin m (2014) improving access to emergency contraception pills through strengthening service delivery and demand generation: a systematic review of current evidence in low and middle-income countries. Plos one 9(10): e109315. Doi:10.1371/journal. Pone.0109315
this clinical practice guideline has been prepared by the social and sexual issues committee, reviewed by the clinical practice gynaecology committee and the family practice advisory committee, and approved by the executive and council of the society of obstetricians and gynaecologists of canada.
http://www.nature.com/articles/srep08487 association between levonorgestrel emergency contraception and the risk of ectopic pregnancy: a multicenter case-control study by jian zhang et al., scientific reports 5, article number: 8487 (2015) doi:10.1038/srep08487