title: One-year contraception with norgestrienone subdermal silastic implants.
mesh_terms: D000568:Amenorrhea / Q000139:chemically induced; D055598:Chemical Phenomena; D002621:Chemistry; D003267:Contraception; D003270:Contraceptive Agents / Q000009:adverse effects / Q000378:metabolism / Q000494:pharmacology*; D005260:Female; D006801:Humans; D006914:Hydroxysteroids / Q000494:pharmacology; D007664:Ketosteroids / Q000494:pharmacology; D008598:Menstruation; D009650:Norpregnanes / Q000494:pharmacology*; D011247:Pregnancy / Q000187:drug effects*; D011271:Pregnancy, Ectopic; D011281:Pregnatrienes / Q000494:pharmacology*; D011372:Progestins / Q000009:adverse effects / Q000378:metabolism / Q000494:pharmacology*; D012826:Silicone Elastomers / Q000494:pharmacology*; D013997:Time Factors; D014592:Uterine Hemorrhage / Q000139:chemically induced
chemical_list: D003270:Contraceptive Agents; D006914:Hydroxysteroids; D007664:Ketosteroids; D009650:Norpregnanes; D011281:Pregnatrienes; D011372:Progestins; D012826:Silicone Elastomers