ellaOne Side Effects: A Pharmacist Answers Your Questions in Brixton
At Junction Pharmacy in Brixton, we often speak with patients who have questions or worries after taking ellaOne, the most commonly used emergency contraceptive pill in the UK. It’s completely normal to have concerns, especially if it’s your first time using it. To help, one of our pharmacists has answered some of the most frequent questions we receive about ellaOne side effects and what to expect afterwards.
Q: What is ellaOne and how does it work?
ellaOne is an emergency contraceptive pill designed to prevent pregnancy after unprotected sex or contraceptive failure, such as a broken condom. It contains ulipristal acetate, a medicine that works by delaying ovulation. This means it prevents an egg from being released until sperm are no longer active in the body, reducing the chance of fertilisation.
It’s most effective when taken as soon as possible after unprotected sex, ideally within 24 hours, but it can still work up to five days later. At Junction Pharmacy, we can advise you on how to take it safely and effectively if you ever need emergency contraception in London.
Q: What are the most common side effects of ellaOne?
The majority of women experience little to no discomfort after taking ellaOne, but mild side effects can occur as your body adjusts to the temporary hormonal change. These may include:
–> Nausea or mild stomach pain
–> Headache
–> Tiredness or dizziness
–> Breast tenderness
–> Spotting or light bleeding before your next period
–> Temporary mood changes or mild irritability
These symptoms usually pass within a few days. Drinking water, eating light meals, and getting plenty of rest can help your body rebalance more quickly.

Q: Will ellaOne affect my next period?
It’s quite common for your next period to arrive a few days earlier or later than expected. Some people also find that their period is lighter or heavier than usual. This is simply your body responding to a short-term shift in hormones.
If your period is more than seven days late, or if it seems unusually light, we recommend taking a pregnancy test to be sure the pill worked as intended. It’s always better to double-check for peace of mind.
Q: Can ellaOne make you feel sick?
A small number of people may feel slightly nauseous after taking ellaOne. This is normal and tends to resolve quickly. If you vomit within three hours of taking the tablet, it’s important to speak with a pharmacist or doctor as you may need another dose.
To reduce nausea, try eating something light beforehand and avoid lying down immediately after taking the pill. If you’re unsure whether the dose worked properly, contact your pharmacist for guidance.
Q: Are there any serious side effects I should watch for?
Serious side effects are very rare. However, if you experience severe abdominal pain, heavy bleeding, chest pain, or an allergic reaction such as swelling or difficulty breathing, seek medical help immediately.
These symptoms are extremely uncommon, but it’s important to know what to look for. Most patients find their experience with ellaOne is smooth and uneventful, with only mild temporary effects.
Q: Can ellaOne cause long-term issues or affect fertility?
No, ellaOne does not affect your long-term fertility. Once your next cycle begins, your natural ovulation pattern will return to normal. You can become pregnant again at any time after taking it, so it’s a good idea to consider reliable contraception going forward.
If you regularly need emergency contraception, it may be worth discussing ongoing birth control options with your pharmacist or GP. At Junction Pharmacy, we’re happy to talk through the choices available and find something that fits your lifestyle.

Q: What can I do to feel better after taking ellaOne?
If you feel tired or a little unsettled, take the rest of the day to relax. Staying hydrated, eating balanced meals, and getting some fresh air can help ease any minor side effects. Avoid comparing your experience to others, as every body reacts slightly differently.
If you have concerns or if symptoms persist for more than a few days, come and speak to one of our pharmacists. We’re here to listen, advise, and provide reassurance.
Q: Where can I get advice about ellaOne or other emergency contraception in London?
You can visit Junction Pharmacy in Brixton or contact us for confidential advice and access to emergency contraception, including ellaOne. Our pharmacists will explain how it works, answer your questions, and help you choose the right option for your situation.
Remember, taking ellaOne is a responsible decision to protect your health and avoid an unplanned pregnancy. Most women tolerate it very well, and any side effects are usually short-lived. If you ever feel unsure or just need reassurance, our team is always available to help you.
This blog was written on behalf of Junction Pharmacy by Pharmacy Mentor.
