title: Update on levonorgestrel for emergency contraception.
authors.forename: S M
authors.initials: SM
authors.lastname: Strayer
authors.forename: R L
authors.initials: RL
authors.lastname: Couchenour
mesh_terms: D003075:Coitus; D003267:Contraception / Q000379:methods*; D003280:Contraceptives, Oral, Synthetic / Q000008:administration & dosage; D004630:Emergencies; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000008:administration & dosage*; D045167:Progesterone Congeners / Q000008:administration & dosage; D013607:Tablets; D014481:United States
chemical_list: D003280:Contraceptives, Oral, Synthetic; D045167:Progesterone Congeners; D013607:Tablets; D016912:Levonorgestrel