Noriday is a progestogen-only pill that contains the active ingredient norethisterone. It is a type of hormonal contraceptive that works by thickening the mucus in your cervix, making it harder for sperm to reach an egg and preventing ovulation. Noriday is suitable for women who are looking for a form of contraception that does not contain estrogen and is safe for use by women who may not be able to take combined hormonal contraceptives.