title: Plan B emergency contraceptive may be ineffective for heavier women.
authors: Laura
authors: L
authors: Eggertson
mesh_terms: D002170:Canada; D003281:Contraceptives, Postcoital; D004348:Drug Labeling; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D009765:Obesity / Q000150:complications*; D011247:Pregnancy; D017211:Treatment Failure
chemical_list: D003281:Contraceptives, Postcoital; D016912:Levonorgestrel