Levonorgestrel.
D003271:Contraceptive Agents, Female / Q000009:adverse effects; D003280:Contraceptives, Oral, Synthetic / Q000009:adverse effects; D000075202:Contraindications; D004347:Drug Interactions; D006801:Humans; D016912:Levonorgestrel / Q000009:adverse effects; D024802:Nurse's Role; D010353:Patient Education as Topic; D018579:Patient Selection; D013997:Time Factors
D003271:Contraceptive Agents, Female; D003280:Contraceptives, Oral, Synthetic; D016912:Levonorgestrel