About norethisterone contraceptive injection

Norethisterone is a progestogen, which is a female sex hormone. It is injected into a muscle in your bottom and will provide contraception for 8 weeks.

Norethisterone works by stopping your egg cells from ripening and being released and it also changes the lining of your womb to make it less likely that a fertilised egg will attach to it. The mucus that surrounds your cervix (neck of the womb) also becomes thicker so that the sperm cannot get through as easily to fertilise an egg.

Before having norethisterone contraceptive injection

Before having norethisterone injection make sure your doctor or pharmacist knows:

• If you think you may be pregnant.
• If you have ever had breast cancer or a cancer of the sex organs.
• If you have vaginal bleeding other than your normal monthly period.
• If you have been told you have any thickening of your arteries or if you have a problem in the way you metabolise fat.
• If you have liver disease or problems with your liver.
• If during a past pregnancy you have had jaundice.
• If you have had an ectopic or abnormal pregnancy.
• If you have sickle-cell anaemia, diabetes or high blood pressure.
• If you are due to have an operation.
• If you have porphyria (a rare blood disorder).
• If you are taking other medicines, including those available to buy without a prescription, herbal and complementary medicines.
• If you have ever had an allergic reaction to this or any other medicine.

How norethisterone contraceptive injection is given

• It is important that before receiving this injection, you read the manufacturer's printed information leaflet. Discuss any questions you have with your doctor.
• You will be given this injection by your nurse or doctor. It is given slowly into a muscle of your bottom.
• The timing of the injection is important so remember to keep your clinic appointment.

Getting the most from your treatment

• This injection does not protect against HIV (AIDS) and other sexually transmitted diseases.
• Your periods may change while you are using this injection. Spotting, breakthrough bleeding and delayed menstruation may occur. If you are concerned about any changes in your cycle, speak with your doctor.
• Norethisterone injection provides contraception for 8 weeks and is often given as an interim measure (for example while your partner is having a vasectomy). Make sure your doctor knows if there is any delay in your longer-term plans for contraception.

Can norethisterone contraceptive injection cause problems?

Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. These usually improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following side-effects continue or become troublesome.

If you experience any other symptoms which you think may be due to this medicine, speak with your doctor or pharmacist.

How to store norethisterone contraceptive injection

• Keep all medicines out of the reach and sight of children.
• Store in a cool, dry place, away from direct heat and light.

Important information about all medicines