Trinordiol tablets are a type of hormonal contraception commonly known as 'the pill' or combined oral contraceptive pill. Trinordiol tablets contain two active ingredients, ethinylestradiol and levonorgestrel. 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 levonorgestrel is a synthetic form of progesterone. Trinordiol is a triphasic pill. This means that each 21 day pack contains three types of tablets, each with a slightly different dose of hormones in it. The six light brown tablets contain 30 micrograms ethinylestradiol and 50 micrograms levonorgestrel, the five white tablets contain 40 micrograms ethinylestradiol and 75 micrograms levonorgestrel, and the ten ochre tablets contain 30 micrograms ethinylestradiol and 125 micrograms levonorgestrel. Trinordiol tablets must be taken in the order specified on the pack, starting with the light brown tablet marked '1'. One tablet is taken every day for 21 days and you then have a seven day break from pill-taking. During your seven day break, the levels of the hormones in your blood drop, which results in a withdrawal bleed that is similar to your normal period. You start the next pack after the seven pill-free days are up, even if you are still bleeding. 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.