Norethisterone is a synthetic form of the hormone progesterone. Rather than allowing for the natural fall in progesterone during your period, Norethisterone keeps your progesterone levels up. This delays the shedding of your womb lining, and therefore delays your period. Norethisterone should be taken 3 days before you expect your next period to begin, and should become effective immediately. It can delay your period by up to 17 days if all 20 days worth of pills are taken. It requires you to take 3 pills a day, and once you stop taking them, your period should start after a couple of days. Norethisterone common Side effects can include feeling sick, breast tenderness, tiredness, bloating, reduced sex drive or headache.
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