Ulipristal acetate for uterine fibroids (Esmya)

Ulipristal acetate is a female hormone treatment.

Take one tablet daily.

The most common side-effects are no periods, hot flushes, and headache.

Type of medicineA progesterone receptor modulator
Used forFibroids in the uterus
Also calledEsmya®
Available asTablets

Ulipristal acetate works by blocking the effects of the female hormone progesterone. There are two brands of ulipristal acetate tablets available. The two brands of tablet have different uses and contain different amounts of ulipristal acetate. Low-strength tablets (Esmya® brand containing 5 mg ulipristal acetate) are used to treat heavy or painful periods caused by uterine fibroids. This leaflet discusses ulipristal acetate when it is prescribed for this purpose. More information is available about the higher strength of ulipristal acetate tablet (EllaOne® brand) in the medicine leaflet called Emergency hormonal contraception.

Fibroids (which are also known as myomas) are non-cancerous growths in the womb (uterus). They can sometimes cause heavy or painful periods, tummy swelling and urinary problems. Surgery is the most common treatment for fibroids which cause symptoms. Ulipristal acetate is prescribed to reduce the size of the fibroids before the surgery.

The female hormone progesterone is thought to play a role in the development of fibroids. Ulipristal acetate works by blocking the effects of progesterone. This stops the fibroids from growing and they shrink in size.

Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking ulipristal acetate for uterine fibroids it is important that your doctor knows:

  • If you are pregnant or breast-feeding.
  • If you have severe asthma.
  • If you have any problems with the way your liver works, or any problems with the way your kidneys work.
  • If you have breast cancer, or cancer of the womb (uterus), neck of the womb (cervix), or ovaries.
  • If you have ever had an allergic reaction to a medicine.
  • If you are taking any other medicines. This includes any medicines you are taking which are available to buy without a prescription, such as herbal and complementary medicines.
  • Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about ulipristal acetate and will provide you with a full list of the side-effects which you may experience from taking it.
  • Take ulipristal acetate exactly as your doctor tells you to. You will be asked to start taking the tablets during a week you are having a period. Continue to take one 5 mg tablet each day. You will be prescribed the tablets for a maximum of four months, possibly on two occasions.
  • You can take ulipristal acetate tablets before or after food.
  • If you forget to take a dose, take it as soon as you remember unless you are more than 12 hours late. If you are more than 12 hours late, leave out the forgotten dose and take your next tablet at the usual time. Do not take two tablets together to make up for a missed dose.
  • Try to keep your regular appointments with your doctor. This is so your doctor can check on your progress.
  • You should avoid getting pregnant both while you are taking ulipristal acetate and for at least 12 days after stopping taking it. Please use a barrier method of contraception (such as a condom), as hormonal methods of contraception are not suitable with ulipristal acetate. If you need further contraceptive advice, please speak with your doctor.
  • Do not drink grapefruit juice while you are on ulipristal acetate. This is because a chemical in grapefruit juice can increase the amount of ulipristal acetate in your bloodstream. This could make side-effects more likely.

Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the most common ones associated with ulipristal acetate. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine but speak with your doctor or pharmacist if any of the following continue or become troublesome.

Very common ulipristal acetate side-effects (these affect more than 1 in 10 women)
What can I do if I experience this?
No periods during the treatment and for a few weeks afterwards, thickening of the lining of the womb (uterus)Your doctor will discuss these with you before you start the treatment
Common ulipristal acetate side-effects (these affect less than 1 in 10 women)What can I do if I experience this?
Headache, other aches or painsAsk your pharmacist to recommend a suitable painkiller
Feeling dizzy or tiredDo not drive or use tools or machines while affected
Feeling sick, tummy (abdominal) painStick to simple meals - avoid rich and spicy foods
Acne, increased weight, breast tenderness, hot flushesIf any of these become troublesome, speak with your doctor

If you experience any other symptoms which you think may be due to the tablets, please speak with your doctor or pharmacist for further advice.

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

Never take more than the prescribed dose. If you suspect that you or someone else might have taken an overdose of this medicine, go to the accident and emergency department of your local hospital. Take the container with you, even if it is empty.

This medicine is for you. Never give it to other people even if their condition appears to be the same as yours.

If you are having an operation or dental treatment, please tell the person carrying out the treatment which medicines you are taking.

If you buy any medicines, check with a doctor or pharmacist that they are suitable for you to take with your other medicines.

Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy which will dispose of them for you.

If you have any questions about this medicine ask your pharmacist.

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Original Author:
Helen Allen
Current Version:
Helen Allen
Peer Reviewer:
Prof Cathy Jackson
Document ID:
29099 (v1)
Last Checked:
14 September 2015
Next Review:
13 September 2018
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The information on this page is written and peer reviewed by qualified clinicians.

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