Quick summary

Type of medicine

Selective progesterone receptor modulator (SPRM) acting as an emergency contraceptive.

Works by

EllaOne contains ulipristal acetate, a selective progesterone receptor modulator (SPRM). It works by delaying or preventing ovulation, thereby stopping the release of the egg and reducing the risk of fertilization after unprotected sex or contraceptive failure. It may also alter the uterine lining, making it less receptive to implantation.

Active ingredient

Ulipristal

Effective within

Within a few hours.

Generic?

No

Side effects

Headache, nausea, abdominal pain, menstrual changes, and dizziness.

Medication details

Description

ellaOne is an emergency contraceptive pill manufactured by HRA Pharma. It helps prevent pregnancy after unprotected sex or when a contraceptive method has failed. It contains ulipristal acetate, an active ingredient that works by delaying or preventing ovulation, so fertilisation cannot occur.

ellaOne is most effective when taken as soon as possible, but it can be used up to 5 days (120 hours) after unprotected intercourse. It comes as a single, easy-to-take tablet, offering a reliable emergency contraception option.

ellaOne does not protect against sexually transmitted infections (STIs) and should not be used as a regular method of contraception. If a pregnancy has already begun, ellaOne will have no effect. For ongoing protection, it is recommended to use a regular contraceptive method after taking ellaOne.

Ingredients

Ulipristal acetate, a selective progesterone receptor modulator.

Side effects

Headache, nausea, abdominal pain, menstrual changes, fatigue, or dizziness.
Less commonly: severe abdominal pain, breast tenderness, vomiting, or mood changes.
Consult a doctor if your period is more than 7 days late or if you experience symptoms suggestive of pregnancy.

Warnings

EllaOne is intended for emergency contraception only and should not be used as a regular method of birth control.
Do not use if you are pregnant, allergic to ulipristal acetate, or have severe uncontrolled asthma.
Effectiveness may be reduced if you are taking certain medications (e.g., St. John’s wort, anticonvulsants, rifampicin).
If vomiting occurs within three hours of taking the tablet, take another dose as soon as possible.
Consult a doctor if your period is more than 7 days late, unusually light, or if you experience any symptoms of pregnancy.

Frequently Asked Questions

How does ellaOne work?

ellaOne delays or prevents ovulation, thereby blocking the release of an egg and reducing the risk of pregnancy after unprotected intercourse.

When should I take ellaOne?

Take it as soon as possible after unprotected intercourse, ideally within the first few hours and no later than 5 days (120 hours). The earlier it is taken, the more effective it is.

Can I take ellaOne if I am already using a contraceptive method?

Yes, but ellaOne may temporarily reduce the effectiveness of hormonal contraception. Use condoms until your next period before resuming your usual contraceptive method.

What should I do if I vomit after taking ellaOne?

If you vomit within three hours of taking the tablet, take another tablet as soon as possible and seek advice from a pharmacist or doctor.

Will ellaOne affect my next period?

Your next period may come a few days earlier or later than expected. If it is more than 7 days late or unusually light, take a pregnancy test.

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