In short

  • Marvelon is an oral contraceptive that both stops the egg from releasing and changes the consistency of mucus on the cervix to make the uterus lining less habitable for sperm.
  • Because it causes hormonal changes, it is possible that you will experience side effects while taking this drug.
  • The most common side effects include headaches, menstrual cramps, heartburn, nausea, vomiting, weight changes, diarrhoea, dizziness and back pain.

Marvelon is an oral contraceptive that both stops the egg from releasing and changes the consistency of mucus on the cervix to make the uterus lining less habitable for sperm. Because it causes hormonal changes, it is possible that you will experience side effects while taking this drug.

What are the common side effects?

The most common side effects include headaches, menstrual cramps, heartburn, nausea, vomiting, weight changes, diarrhoea, dizziness and back pain. For most people, these side effects are going to be quite mild, and they should go away in time as your body gets used to the drug. If you experience these side effects in any severe way, then you need to let your doctor know. Severe side effects mean that your body is rejecting the drug, and you need to stop using it and find an alternative.

Can you be allergic to Marvelon?

You may also suffer an allergic reaction to the drug. There are several different ingredients in Marvelon, and you could be allergic to any of them. You will know you are having an allergic reaction if you start to break out in hives or rashes or you have some trouble breathing. You may also feel itchy or experience some swelling in your tongue or extremities. If any of these symptoms occur, then you need to contact medical help right away. Allergic reactions have the potential to be the most dangerous kind of side effects because they can be fatal in some cases.

What are the serious side effects of Marvelon?

There are some serious side effects you need to watch out for as well. They include lumps in the breast tissue, increased bleeding during periods or less bleeding than normal during periods, spotting between periods, depression, flu-like symptoms and severe headaches (like migraines). If you experience any of these symptoms, then you need to get medical help right away. These side effects can be indicative of a serious medical condition or dangerous interaction, and they need to be treated right away before the problem becomes worse.

What should you do if you notice any side effects?

Aside from those listed here, there may be other possible side effects as well. Ensure that you always read the patient information leaflet thoroughly and if you experience anything out of the ordinary, contact your doctor and get advice on how to proceed. Some side effects can occur if you do not follow the dosage procedure with these pills. If you take too much or skip a dose, you can exacerbate the side effects or increase your chances of becoming pregnant.

Because hormonal changes affect everyone differently, your side effects could be different from what has already been discovered. It’s a good idea to let your doctor know once any side effects begin.

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Sources

References

2 sources were selected to match the subject of this article. Link destinations were checked twice when added. This does not mean every statement has been individually source-mapped or clinically approved.

  1. Side effects and risks of the combined pill

    NHS · HTML · NHS contraception safety guidance · Link destination checked 5 September 2026

  2. Combined hormonal contraceptives and venous thromboembolism: review confirms risk is small

    Medicines and Healthcare products Regulatory Agency · HTML · UK regulator drug-safety update · Link destination checked 5 September 2026

Reference links open the cited source pages. If you spot something out of date, tell our content team.

Who wrote this

Written and reviewed by our team

Authored by

Hywel McGlinchy - Pharmacist and Medical Writer

Pharmacist / Content Writer

Hywel has been a registered pharmacist since 2017; he started with Simple Online Pharmacy in 2020. Hywel was responsible for helping review and author accurate site content. He worked with our GPs to make sure all aspects of the medications mentioned are covered.

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Medically reviewed by

Karim Nassar, Co-Founder, Pharmacist & Author

Karim Nassar

Co-Founder, Pharmacist & Author

Karim is a registered pharmacist with the General Pharmaceutical Council (GPhC) and was a founding member of Simple Online Healthcare in 2015. With a Master of Pharmacy degree from Strathclyde University, Karim brings a strong foundation in pharmaceutical care and a passion for leveraging digital solutions to improve patient access to healthcare.

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