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 Level 4
 
 G - Genito urinary system and sex hormonesG03 - Sex hormones and modulators of the genital systemG03A - Hormonal contraceptives for systemic useG03AB - Progestogens and estrogens, sequential preparations
 
 G03AB01 - Megestrol and estrogenG03AB02 - Lynestrenol and estrogenG03AB03 - Levonorgestrel and estrogenG03AB04 - Norethisterone and estrogenG03AB05 - Desogestrel and estrogenG03AB06 - Gestodene and estrogenG03AB07 - Chlormadinone and estrogenG03AB08 - Dienogest and estrogenG03AB11 - Norgestimate and estrogen
 
 
 
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