title: Emergency contraception: when and how to use it.
authors.affiliation: Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Sanfilippo
authors.forename: Don
authors.initials: D
authors.lastname: Downing
mesh_terms: D000293:Adolescent; D000328:Adult; D044363:Contraception, Postcoital / Q000191:economics / Q000379:methods*; D003280:Contraceptives, Oral, Synthetic / Q000009:adverse effects / Q000494:pharmacology; D003281:Contraceptives, Postcoital; D003376:Counseling; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000009:adverse effects / Q000494:pharmacology; D008597:Menstrual Cycle / Q000187:drug effects; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000517:prevention & control* / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology
chemical_list: D003280:Contraceptives, Oral, Synthetic; D003281:Contraceptives, Postcoital; D016912:Levonorgestrel