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What is Norethisterone?

Norethisterone is a synthetic version of the female hormone progesterone that is used to stop your period from coming on time. While Norethisterone is frequently used to delay periods, it has other uses such as treating endometriosis.


It is important to note that while Norethisterone tablets can delay your period, it is not a contraceptive. It is important to use contraceptive methods while taking this medication as it will not prevent pregnancy.

Do not store above 25°C
Take as prescribed
Do not use after the expiry date

How does Norethisterone work?

Before your period, the level of progesterone in your body decreases. When progesterone falls beneath a certain level, menstruation occurs as a result of the lining in the womb shedding. Norethisterone is a synthetic version of progesterone. Taking Norethisterone thus delays the onset of menstruation in the same way that natural levels of progesterone do. You should have a period 2-3 days after stopping Norethisterone because the decrease of the synthetic hormone in the body causes the lining of the womb to shed.

Norethisterone may not be suitable if you have a history of blood clots

How do you take Norethisterone?

The typical dosage for Norethisterone is one tablet three times a day starting three days before the expected beginning of the period. Norethisterone tablets should be swallowed with water. Do not take Norethisterone as a form of birth control. Norethisterone does not prevent pregnancy.

How effective is Norethisterone in delaying menstruation?

Norethisterone tablets are a cheap and effective way of delaying the start of your period. You can buy them online here. However, while Norethisterone is an effective way of delaying menstruation, it is NOT an effective birth control method. Period delay medication does not prevent pregnancy. In order to prevent unwanted pregnancy, please use contraceptive methods while taking this medication.

What are the common side effects of Norethisterone?

Like any medication, Norethisterone can cause side effects. However, these side effects are typically mild and not everyone will experience them. The most frequent side effects of delaying your period are menstrual disturbances, premenstrual-like symptoms and headaches. For additional side effects, please see the patient information leaflet.

If you experience any side effects from taking this medication, you can report them through the MHRA’s Yellow Card Scheme

* Disclaimer: Results and individual responses to treatments may vary from person to person. If you do need medical advice you should always speak to a doctor, pharmacist or appropriate medical professional.