Home Ground Pharmacy
What are the Most Common Morning After Pill Side Effects? — Emergency Contraception Swindon
07Jul2026
What are the Most Common Morning After Pill Side Effects? — Emergency Contraception Swindon
The most common morning after pill side effects are generally mild and short-lived, with the majority of people experiencing little to no disruption to their daily life. These can include nausea, headache, tiredness, abdominal pain, and changes to your next period, such as it arriving earlier or later than expected, or being lighter or heavier than usual. Some people also experience breast tenderness, dizziness, or spotting in the days following the pill. At Home Ground Pharmacy in Swindon, our trained pharmacists can talk you through what to expect, answer any concerns, and provide emergency contraception confidentially and without judgement.
If you need emergency contraception today, book your confidential consultation at Home Ground Pharmacy Swindon now.
Key Takeaways
–> Most morning after pill side effects are mild and resolve within a day or two.
–> Common side effects include nausea, headache, fatigue, and abdominal pain.
–> Your next period may arrive earlier, later, lighter, or heavier than usual.
–> If you vomit within 2 hours of Levonelle or 3 hours of ellaOne, you may need to take another dose.
–> Serious side effects are rare, and the morning after pill is considered very safe for most people.
–> Home Ground Pharmacy in Swindon offers a confidential consultation to discuss any concerns about side effects before or after taking the pill.
The Morning After Pill: Why Side Effects Occur
The morning after pill works by altering your hormone levels to delay or prevent ovulation, which is why some temporary side effects can occur as your body responds to this hormonal shift. There are two types available in the UK, Levonelle (levonorgestrel) and ellaOne (ulipristal acetate), and while both are generally well tolerated, their side effect profiles can differ slightly due to the way each hormone works in the body.
It is worth remembering that experiencing side effects does not mean the pill has not worked, nor does the absence of side effects mean it has failed. Side effects are simply your body’s natural response to a temporary hormonal change and are not an indicator of effectiveness either way.
Common Side Effects of the Morning After Pill
Here is a closer look at the side effects most commonly reported after taking emergency contraception, along with how long they typically last.
| Side Effect | How Common | Typical Duration |
|---|---|---|
| Nausea | Common | A few hours to 1 day |
| Headache | Common | 1 to 2 days |
| Fatigue | Common | 1 to 2 days |
| Abdominal pain | Common | 1 to 2 days |
| Breast tenderness | Less common | Up to a few days |
| Irregular bleeding or spotting | Common | Until the next period |
| Change to next period | Common | One menstrual cycle |
Table 1: Common Morning After Pill Side Effects and Typical Duration
For most people, these side effects are mild enough that they do not interfere significantly with day-to-day activities, and they typically resolve on their own without any treatment. If you do experience nausea, eating a small snack before taking the pill or taking it with food can sometimes help reduce this effect.
What if I Vomit After Taking the Pill?
One of the most important things to know about morning after pill side effects is what to do if vomiting occurs shortly after taking it, as this can affect how well the medication is absorbed. If you vomit within 2 hours of taking Levonelle, or within 3 hours of taking ellaOne, the pill may not have been fully absorbed and you should seek advice on whether a repeat dose is needed.
If this happens, contact a pharmacist, sexual health clinic, or GP as soon as possible rather than waiting, as timing is critical with emergency contraception. Our pharmacists at Home Ground Pharmacy can advise you quickly on the right next steps if this occurs.
Call us to get in touch with our team if you are concerned about side effects or unsure what to do next, we are happy to talk it through with you.
How Will the Morning After Pill Affect My Next Period?
Changes to your next period are one of the most commonly reported effects of emergency contraception, and this is completely normal. Your period may arrive a few days earlier or later than expected, and it may be lighter, heavier, or accompanied by some spotting beforehand. These changes are typically temporary and your cycle should return to its usual pattern the following month.
If your period is more than 7 days late, or notably different from your usual pattern in a way that concerns you, it is worth taking a pregnancy test to rule out pregnancy and to put your mind at ease. Our pharmacists can also advise on next steps if you remain unsure.
Are There Any Serious Side Effects to Be Aware Of?
Serious side effects from the morning after pill are rare, and for the vast majority of people it is considered a very safe medication. However, you should seek medical attention if you experience severe abdominal pain that does not improve, particularly if accompanied by dizziness or fainting, as this could in rare cases indicate an ectopic pregnancy or another underlying issue requiring assessment. Ectopic pregnancy is a medical emergency, if you experience severe one-sided abdominal pain, especially with dizziness or fainting, seek urgent medical attention immediately rather than waiting for a routine appointment.
Allergic reactions are also extremely rare but can occur, and you should seek urgent medical help if you notice swelling of the face, lips, or throat, difficulty breathing, or a widespread rash after taking the pill. Our pharmacists will always ask about your medical history before supplying emergency contraception to help minimise any risk of complications.
If you have any concerns about serious side effects, contact our team at Home Ground Pharmacy Swindon and we will advise you on the right course of action.
Frequently Asked Questions
To help put your mind at ease, our Swindon pharmacy team has answered the questions we are asked most regularly about morning after pill side effects.
How long do morning after pill side effects usually last?
Most side effects, such as nausea, headache, and fatigue, typically resolve within 1 to 2 days of taking the pill. Changes to your next period are the longest-lasting effect and usually settle back to your normal pattern within one menstrual cycle.
Can the morning after pill make me feel sick?
Yes, nausea is one of the most commonly reported side effects of the morning after pill, particularly with ellaOne, though it is usually mild and short-lived. Taking the pill with food or a small snack can help reduce the likelihood or severity of nausea for some people.
Will the morning after pill affect my mood?
Some people report feeling more emotional, tired, or low in mood in the day or two after taking emergency contraception, though this is not experienced by everyone. These effects are usually temporary and related to the hormonal shift caused by the medication, settling once your body has adjusted.
Is it normal to bleed after taking the morning after pill?
Yes, some light bleeding or spotting in the days following the pill is a common and normal side effect, often linked to the hormonal changes triggered by the medication. This is different from your regular period and should settle before your next expected cycle.
Should I be worried if I do not experience any side effects?
No, not experiencing any side effects does not mean the morning after pill has not worked, as everyone’s body responds differently to the medication. The absence of side effects is not linked to effectiveness in either direction, but if your period is more than 7 days late, it is worth taking a pregnancy test.
Can I take painkillers for morning after pill side effects?
Yes, over-the-counter painkillers such as paracetamol or ibuprofen can usually be taken to help manage headaches or abdominal cramping after the morning after pill. If you are unsure which painkiller is suitable for you, our pharmacists at Home Ground Pharmacy can advise based on your medical history.
Confidential Support for Your Sexual Health
Understanding the potential side effects of the morning after pill can help you feel more prepared and less anxious if you do need to take it. While mild side effects such as nausea, headache, and changes to your next period are common, they are almost always temporary and far less significant than the alternative of an unplanned pregnancy.
At Home Ground Pharmacy in Swindon, our pharmacists are here to talk you through what to expect, answer any questions you may have, and provide emergency contraception quickly and confidentially, without the need for a GP appointment. You do not need to navigate this alone, our friendly team is ready to help whenever you need us. Book your confidential consultation today.
☑ Clinically Reviewed by Pharmacy Mentor
A pharmacist reviews the content to help ensure medicines are presented responsibly and that patient facing health information is accurate, appropriate, and aligned with current clinical guidance.
Last reviewed: 7 July 2026
Written on behalf of Home Ground Pharmacy by Pharmacy Mentor.