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Micronor is very effective at preventing unwanted pregnancies, but it needs to be taken at the same time everyday to work properly. Unlike combined pills, which allow for a slightly more flexible schedule, Micronor can fail to work if it is taken more than three hours late. This is due to the fact that it is a progesterone-only pill, which contains a low dose of hormones. It is taken on a daily basis, without a break.
It is very important that you stick to a daily routine of taking your mini pill at the same time. Be particularly careful when travelling across time zones, to make sure you do not risk falling pregnant.
What happens if I forget to take my pill?
If you do forget to take your pill and more than three hours have passed since the time that it was due, you need to take it as soon as you remember. The next dose must follow at your usual time, even if this means that you are taking two Micronor pills on the same day. You will also need to use an additional method of contraception for two days.
If you have had sex in the two days before you missed a pill, you could get pregnant. You should speak to a doctor for advice on whether you need emergency contraception.
What do I need to do if I vomit?
If you vomit or have severe diarrhoea within three hours of taking Micronor, you will have to take an additional dose to make sure that you are protected from pregnancy. If you suffer from ongoing problems with your digestion, you may need to consider an alternative form of contraception.
What if I miss a period on Micronor?
It is not unusual for periods to be lighter and less painful when taking a contraceptive pill. Many women regard this as a positive side effect of Micronor. If you have taken your pills as advised it is highly unlikely that you are pregnant. However, if you miss another period, or if you are really worried, you could take a pregnancy test to confirm that your contraception was successful.
Many women experience bleeding and spotting in between periods. This is a very common side effect, not only of Micronor but of most progesterone-only pills. If you experience very heavy or ongoing bleeding whilst you’re taking your pill, see a doctor as soon as you can.
Can I take Micronor while breastfeeding?
Due to its low hormone levels, Micronor can be taken by breastfeeding women. Oestrogen-free pills are also often recommended to women who smoke, are obese or are otherwise at risk of thrombosis (blood clots). Please note that our service is for repeat prescriptions only. If you have never taken Micronor before, please speak to a GP in your local area.
Micronor contains norethisterone. This is a synthetic version of the naturally occurring sex hormone progesterone. Each tablet contains 350 micrograms norethisterone and this is the ‘active ingredient’ in the medication. Each Micronor tablet also contains magnesium stearate, pregelatinised starch and lactose.
The pills are small, round and white. They are engraved ‘C035’ on one side.
A very common side effect of Micronor is bleeding and spotting between periods. More than one in ten women experience this side effect during treatment with Micronor.
Common Side Effects
- nausea and vomiting
- breast tenderness
- missed periods
Uncommon Side Effects
- skin problems (such as acne and rash)
- stomach problems
- hair loss and excessive hair growth
- leg pain
- period pain
- heavy bleeding
- itchy rash
- vaginal discharge
- ovarian cyst
- breast pain
- aprepitant and fosaprepitant (drugs used in chemotherapy)
- anti-HIV medicines
- barbiturates (regularly prescribed for anxiety, depression and insomnia)
- St. John’s Wort
- rifampicin and rifabutin (used to treat tuberculosis)
- griseofulvin (prescribed to treat fungal infections)
- bosentan (used to treat pulmonary arterial hypertension - or high blood pressure in the blood vessels that supply the lungs)
- some epilepsy treatments (for example carbamazepine and phenytoin)
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