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  1. NLM Digital Collections - Clinical drug interaction studies with combined oral contraceptives : guidance for industry 
    Publication: Silver Spring, MD : Center for Drug Evaluation and Research, June 2023
    resource.nlm.nih.gov/9918662583206676
    ... in the United States, such as norethindrone (NET), norgestimate (NGM), levonorgestrel (LNG), or drospirenone (DRSP), combined with ... Levonorgestrel NDA New drug application NET Norethindrone NGM Norgestimate PD Pharmacodynamic PK Pharmacokinetic PLR Physician labeling rule ...