 [ Symptoms ] what is the difference in norethindrone 0 35mg azurette and loestrin birth control pills [ Disease ] azurette and loestrin are combination oral contraceptives which means they contain an estrogen and progestin that work together to prevent pregnancy norethindrone 0 35mg is a progestin only form of birth control these forms are generally reserved for women who cannot take estrogens such as women who are breastfeeding progestin only forms of birth control are not as effective as combination versions and need to be taken every day with no pill free days