Norethisterone Acetate
Is It Right for You?
A complete guide to Norethisterone Acetate — what it treats, how it works, dosages, side effects, and when a clinician may prescribe it following an online consultation.
What Is Norethisterone Acetate?
Norethisterone acetate is a progestogen used mainly as part of hormone replacement therapy (HRT). Combined with an oestrogen, it protects the lining of the womb during menopause treatment.
It is closely related to norethisterone and is found in combined HRT tablets and patches, such as Kliovance, Kliofem, and Evorel Conti, where it is paired with estradiol.
Norethisterone acetate is a prescription-only medication in the UK. A licensed clinician can review your symptoms and medical history through a telehealth consultation and prescribe where appropriate.
What Conditions Is Norethisterone Acetate Used For?
Norethisterone acetate is mainly used for:
given with oestrogen to protect the womb lining in women who still have a womb.
as part of combined HRT that relieves hot flushes, night sweats, and other symptoms.
helping provide either a regular monthly bleed or, in continuous regimens, no regular bleed.
If you still have a womb and take oestrogen, a progestogen such as norethisterone acetate is essential to protect the womb lining. Do not stop the progestogen part of HRT without advice, as oestrogen alone can thicken the lining.
How Does Norethisterone Acetate Work?
Norethisterone acetate is a progestogen. In HRT, it balances the effect of oestrogen on the lining of the womb.
Oestrogen alone can cause the womb lining to thicken, which over time raises the risk of problems. The progestogen keeps the lining in balance, reducing this risk.
Depending on the regimen, it is either taken on certain days to give a monthly bleed (cyclical HRT) or every day with oestrogen to aim for no bleeding (continuous combined HRT).
Dosages & Administration
The correct dose depends on the type and severity of infection, age, weight, and kidney function. Always follow your clinician's instructions. The table below is for general reference only.
Administration Tips
Take tablets or apply patches exactly as prescribed, as the regimen is designed to protect the womb lining and control bleeding.
Report any unexpected bleeding, especially new or heavy bleeding, so it can be checked by your clinician.
Side Effects of Norethisterone Acetate
Side effects are usually mild and reflect its progestogen action within overall HRT.
- Breast tenderness
- Headache or migraine
- Bloating
- Mood changes
- Nausea
- Changes in bleeding pattern
- Acne or skin changes
- Signs of a blood clot - swollen, painful leg, chest pain, breathlessness
- New, heavy, or persistent unexpected vaginal bleeding
- Severe abdominal pain
- Yellowing of the skin or eyes
- Severe allergic reaction
Tell your clinician about any unexpected, persistent, or heavy vaginal bleeding on HRT. While often harmless, it sometimes needs investigation to rule out problems with the womb lining.
Drug Interactions
Always disclose all prescription drugs, over-the-counter medicines, vitamins, and supplements to your clinician or pharmacist before starting norethisterone acetate.
Some epilepsy medicines, rifampicin, and St John's Wort can reduce the effect of HRT hormones; your clinician will advise.
These can affect hormone levels; your clinician will review your suitability.
Norethisterone can raise ciclosporin levels, which may need monitoring.
Tell your clinician about other hormones you take so your HRT can be balanced safely.
Important Warnings
If you have a womb, the progestogen part of HRT is essential to protect the womb lining. Take it as prescribed and do not skip it without advice.
HRT has both benefits and small risks, including effects on clot and breast risk that vary by type, dose, and your own health. Your clinician will discuss these with you.
HRT may be unsuitable with certain conditions, such as some cancers, clotting disorders, or liver disease. Share your full medical history.
HRT is reviewed regularly to check it is still suitable, effective, and at the lowest dose needed for your symptoms.
Speak to a Clinician About Treatment
Getting advice no longer means sitting in a waiting room. Through The GP Service, you can consult with a licensed clinician in minutes — from home, on your lunch break, or wherever works for you. If treatment is clinically appropriate, your clinician can issue a prescription during the consultation. A consultation does not guarantee a prescription.
The treatment you need, when you need it.
Norethisterone Acetate FAQs
Yes. A licensed clinician can review your menopause symptoms and medical history through a telehealth consultation and prescribe norethisterone acetate-containing HRT where appropriate.
If you still have a womb, the progestogen protects the womb lining from the thickening that oestrogen alone can cause, reducing the risk of problems.
This depends on the regimen. Cyclical HRT usually gives a monthly bleed, while continuous combined HRT aims for no regular bleeding, though spotting can occur at first.
It is a closely related progestogen used specifically within combined HRT products to protect the womb lining alongside oestrogen.
Tell your clinician. Some bleeding changes are common when starting HRT, but new, heavy, or persistent bleeding should be checked.
There is no fixed limit; HRT is reviewed regularly to balance benefits and risks for your symptoms and health. Your clinician will advise on duration.