Binovum tablets are a type of hormonal contraception commonly known as 'the pill' or combined oral contraceptive pill. Binovum tablets contain two active ingredients, ethinylestradiol and norethisterone. These are synthetic versions of the naturally occurring female sex hormones, oestrogen and progesterone. Ethinylestradiol (previously spelt ethinyloestradiol in the UK) is a synthetic version of oestrogen and norethisterone is a synthetic form of progesterone. The daily dose of hormones taken in the pill work mainly by tricking your body into thinking that ovulation has already happened. This prevents an egg from ripening and being released from the ovaries each month. Binovum is a biphasic pill. This means that each 21 day pack consists of two types of tablets that contain a slightly different dose of hormones. The seven white tablets contain 35 micrograms ethinylestradiol and 500 micrograms norethisterone and the 14 peach coloured tablets contain 35 micrograms ethinylestradiol and 1 mg norethisterone. The contraceptive pill results in lighter, less painful and more regular menstrual bleeding. This means it is sometimes prescribed for women who have problems with particularly heavy, painful or irregular periods.