Combined pill or mini pill? It's often the first big decision when you're starting or switching contraception.
Both are over 99% effective when you take them properly.1 But they work differently, use different hormones, and don't suit everyone the same way.
Here's what actually sets them apart, and how to work out which one's right for you.
What's the difference between the combined pill and the mini pill?
They're both hormonal. That's about where the similarity ends.
The combined pill uses two hormones: oestrogen and progestogen. Together, they mainly stop your ovaries releasing an egg each month. They also thicken the mucus at the entrance to your womb, so sperm can't get through, and change the womb lining.2
Taken correctly, it's over 99% effective. That means fewer than 1 in 100 people using it get pregnant in a year.1
The mini pill is simpler in one sense. Just one hormone: progestogen, no oestrogen at all. Traditional mini pills, like Noriday, mainly work by thickening the mucus at your cervix so sperm can't get through.3 Desogestrel mini pills, like Cerazette, also stop ovulation.4
It's just as effective with perfect use. But real life isn't always perfect. With typical use, where a pill gets missed or taken late now and then, around 9 in 100 people get pregnant in a year on either type of pill.1 Timing matters even more with the mini pill, as you'll see below.
Oestrogen is the deciding factor. Whether you can take it often decides which pill suits you.
Which pills does Pharmica offer?
Pharmica prescribes both types, across several brands. Not every brand suits every person, which is why there's a range of options.
Combined pill
Pharmica's combined pill range includes Rigevidon, Gedarel, Yasmin, Lucette, Marvelon and Mercilon.
Some are 21-day pills, taken for 21 days with a 7 day break. Others come with dummy pills, so you take one every day.5 Brands also vary slightly in hormone dose and type, which is often why one suits you better than another.
Mini pill (progestogen-only)
Pharmica's mini pill range includes Noriday, Norgeston and Cerazette. No breaks here, you take one every single day.6
Noriday and Norgeston are traditional mini pills with a strict 3 hour window. Miss that window and you may not be protected.3,6,7
Cerazette contains desogestrel instead, which gives you a 12 hour window. Much more forgiving if your routine changes day to day.4,6
Unpredictable routine? A 12-hour window gives you far more breathing room than the traditional 3 hours.
Who might the mini pill suit better?
The mini pill often gets recommended to people who can't, or don't want to, take oestrogen. That includes people who are breastfeeding and smokers aged 35 or over.8,9
A history of blood clots is different. The combined pill usually isn't suitable.8 A mini pill may still be an option, but it needs an individual assessment. Suitability and licensing differ between mini pill brands, so your prescriber will choose the right one for you. For example, Noriday's licence lists a past blood clot as a reason not to use it, while Cerazette's lists only a current one.3,4
Migraine is a good example. If you get migraine with aura, the combined pill isn't considered suitable, as it can increase the risk of a stroke.2,8 On the other hand, the mini pill doesn't carry that same restriction.9
If your migraines come without aura, the combined pill might still be fine for you. It depends on other risk factors, like smoking or high blood pressure. This is why our prescribers check during your online consultation, to make sure the option you choose is suitable.
“If you get migraine with aura, the combined pill isn't suitable because it contains oestrogen. A progestogen-only pill may be an option after a suitability check. Follow the instructions for your particular pill, as missed-pill rules vary, and ask whether you'll need extra contraception when switching.
Ana Carolina GoncalvesSuperintendent Pharmacist
If you get migraine with aura for the first time while taking the combined pill, stop taking it and contact your prescriber promptly.2 Use condoms or avoid sex until you've had advice about ongoing protection. If you've had unprotected sex recently, ask straightaway whether you need emergency contraception.
Sudden or unfamiliar symptoms, such as weakness, numbness or problems with your speech or vision, need urgent assessment. You may need to call 999.10
Your health can change which pill suits you, so mention any new diagnosis when your prescription is reviewed.
What side effects should you expect?
Many people get on well with both pills. But side effects can happen, and the pattern differs a bit.
Combined pill
- Breakthrough bleeding - bleeding between periods, common in the first few months while your body adjusts.11
- Headaches, mood changes, feeling sick and sore breasts - some people report these. Varies a lot between individuals.11
- Raised blood pressure - the pill can cause high blood pressure in a small number of people.11
Many side effects show up early. If they're still a problem after three months, ask about changing pill.
Mini pill
- Changes to your periods - they may be lighter or more frequent, or stop altogether. You might also get spotting between periods.12
- Nausea and sore breasts - can happen with desogestrel pills such as Cerazette.4
If side effects are still bothering you after three months, speak to a pharmacist or doctor. Switching brand, or type, can help.11
Can you switch between the two?
Yes. Plenty of people do, at some point.
Maybe you've started a new job or you've just had a baby. Maybe a new migraine or blood pressure diagnosis has changed what's suitable for you.
How you switch, and whether you'll need backup contraception like condoms for a few days, depends on where you are in your current pack and which pill you're switching to.6
Do not try to work this out alone. Talk it through with a pharmacist, nurse or prescriber so you know exactly when you're covered.
Switching pills can leave a gap in protection, so check whether you need condoms for a few days.
When should you seek medical advice?
Blood clots on the combined pill are rare, affecting up to 1 in 1,000 people. But their signs need urgent attention, and some need a 999 call.11
Call 999 if you notice possible signs of a stroke, such as:10
- Sudden problems with your speech
- Weakness or numbness in one arm, or on one side of your face
- Sudden blurred vision or loss of sight
Do not wait until the end of your combined pill pack if you get migraine with aura for the first time. Stop taking it, speak to your prescriber promptly and use condoms until you know you are protected.
Call 999 or go to A&E if you get sudden chest pain or breathlessness. Do not drive yourself.13
New pain or swelling in one leg needs urgent medical advice. Ask for an urgent GP appointment or call NHS 111, and call 999 if it comes with chest pain or breathlessness.14 Coughing up blood also needs urgent advice.13
A severe headache can also be a sign of a stroke, so do not wait to see if it passes if it comes with any of the signs above.10
Frequently asked questions
Can I switch from the combined pill to the mini pill, or the other way round?
Yes, and plenty of people do. How you switch safely depends on where you are in your current pack and which pill you're moving to. You may need condoms for a few days. It's best to check with a pharmacist, nurse or prescriber rather than switching on your own, so you know exactly when you're protected.
Is the mini pill less effective than the combined pill?
Not with perfect use. Both are over 99% effective. With typical use, both drop to around 91%, because pills get missed or taken late. The mini pill is stricter about timing. You're still protected if you take it within 3 hours of your usual time for a traditional pill, 12 hours for desogestrel, or 24 hours for drospirenone.
Can I take the mini pill while breastfeeding?
Yes. The NHS says the mini pill is safe to use when you're breastfeeding, and you can start it straight after having a baby. The combined pill is different. If you're breastfeeding, the NHS advises waiting 6 weeks after giving birth before starting it, and using condoms until then. Always check with a pharmacist or GP about your own circumstances.
Does the combined pill cause weight gain?
There's no evidence that taking the combined pill makes you put on weight, according to the NHS. Some people notice weight changes while on the pill, but these are usually down to other factors. For the mini pill, there isn't enough evidence to say whether weight gain is linked. If side effects bother you after three months, speak to a pharmacist or doctor.
What should I do if I forget to take my pill?
It depends on which pill you take and how late you are. For a mini pill, take the missed pill as soon as you remember. You're still protected if you're within 3 hours (traditional), 12 hours (desogestrel) or 24 hours (drospirenone) of your usual time. For the combined pill, check your leaflet or ask a pharmacist, because the rules vary.
Can I take the combined pill if I get migraines?
It depends on the type. If you get migraine with aura, the combined pill isn't considered suitable, because it can increase the risk of a stroke. Migraine without aura may still be an option, depending on other risk factors like smoking or high blood pressure. If you get aura for the first time on the combined pill, stop taking it and speak to your prescriber promptly.
References
- NHS. How well contraception works at preventing pregnancy. NHS website; 2024. nhs.uk
- Gedeon Richter Plc. Rigevidon coated tablets: Summary of Product Characteristics. Electronic Medicines Compendium; 2022. medicines.org.uk/emc
- Pfizer Limited. Noriday 350 microgram tablets: Summary of Product Characteristics. Electronic Medicines Compendium; 2023. medicines.org.uk/emc
- Organon Pharma (UK) Limited. Cerazette 75 microgram film-coated tablet: Summary of Product Characteristics. Electronic Medicines Compendium; 2025. medicines.org.uk/emc
- NHS. How to take the combined pill. NHS website; 2024. nhs.uk
- NHS. How to take the progestogen-only pill. NHS website; 2024. nhs.uk
- Bayer plc. Norgeston tablets: Summary of Product Characteristics. Electronic Medicines Compendium; 2021. medicines.org.uk/emc
- NHS. Who can take the combined pill. NHS website; 2024. nhs.uk
- NHS. Who can take the progestogen-only pill. NHS website; 2024. nhs.uk
- NHS. Stroke: symptoms. NHS website; 2024. nhs.uk
- NHS. Side effects and risks of the combined pill. NHS website; 2024. nhs.uk
- NHS. Side effects and risks of the progestogen-only pill. NHS website; 2024. nhs.uk
- NHS. Pulmonary embolism. NHS website; 2026. nhs.uk
- NHS. DVT (deep vein thrombosis). NHS website; 2026. nhs.uk
This article is intended for informational purposes only and does not replace professional medical advice. Always read the patient information leaflet supplied with your medication and speak to a healthcare professional if you have specific concerns.