Anatomical Therapeutic Chemical (ATC) classification [BR:br08303]
G GENITO URINARY SYSTEM AND SEX HORMONES
G03 SEX HORMONES AND MODULATORS OF THE GENITAL SYSTEM
G03F PROGESTOGENS AND ESTROGENS IN COMBINATION
G03FA Progestogens and estrogens, fixed combinations
G03FA01 Norethisterone and estrogen
D04462 Norethisterone and mestranol
G03FB Progestogens and estrogens, sequential preparations
G03FB05 Norethisterone and estrogen
D04462 Norethisterone and mestranol