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Frequently asked questions
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What is Feminax Ultra and how does it work?
Feminax Ultra is an over-the-counter painkiller specifically designed to relieve period pain. It contains the active ingredient naproxen 250mg, which is a type of medicine used for the relief of pain and inflammation. Naproxen works by blocking the action of prostaglandins — the natural chemicals responsible for causing pain, swelling, and inflammation. By reducing the levels of prostaglandins in the body, Feminax Ultra helps ease the cramping and discomfort associated with your period.
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How long does Feminax Ultra last and how quickly does it work?
Feminax Ultra works directly at the site of the pain to offer long lasting relief. The first dose offers relief that can last for eight hours, or longer — and for some women, relief can be for up to 12 hours. It is also gastro-resistant, which means the tablet is specially coated to help minimise stomach side effects.
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How do I take Feminax Ultra?
On the first day, take two tablets to start with, then take one tablet 6 to 8 hours later if needed. Then if needed on the second and third days, take one tablet every 6 to 8 hours. Do not take more than 3 tablets a day. Tablets should be swallowed whole with a glass of water and taken with or after food. Feminax Ultra should NOT be taken for more than 3 days in any one month (menstrual cycle). If after 3 days you are still experiencing pain, speak to your doctor.
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Q: Who is Feminax Ultra suitable for?
Feminax Ultra is a painkiller available over the counter in the UK for women aged between 15 and 50 for period pain relief and menstrual cramps. It is not suitable for everyone. You should not take Feminax Ultra if you are allergic to naproxen, aspirin, or any other NSAID, or if you have a history of stomach ulcers, bleeding, or gastrointestinal problems. Always read the patient information leaflet before use, and if you are unsure whether Feminax Ultra is right for you, speak to one of our pharmacists.
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Can I take Feminax Ultra with other painkillers or medicines?
You can take Feminax Ultra with paracetamol and opioid painkillers such as codeine (for example, co-codamol). Feminax Ultra should not be taken with ibuprofen, diclofenac, or aspirin, as these are also NSAIDs, and taking too many NSAIDs together can cause side effects. You should also not take Feminax Ultra alongside mefenamic acid or any other NSAID. If you are taking any other regular medication, please check with a pharmacist or doctor before using Feminax Ultra.
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What are the possible side effects of Feminax Ultra?
Like all medicines, Feminax Ultra can cause side effects, though not everyone will experience them. Common side effects may include nausea, indigestion, or stomach discomfort — taking the tablets with food can help reduce this. Less common side effects can include headaches, drowsiness, dizziness, and skin sensitivity to light. More serious side effects, which are rare, include severe blisters and bleeding of the skin, nose and mouth (Stevens-Johnson syndrome) and pain around the lower side of the back (kidney area). If you experience any serious side effects, stop taking Feminax Ultra and seek medical advice immediately.
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Can I take Feminax Ultra if I am pregnant or breastfeeding?
Feminax Ultra is not recommended during pregnancy, particularly during the first and third trimesters, as it may harm the unborn baby. If you are pregnant, planning to become pregnant, or breastfeeding, you should speak to your doctor or pharmacist before taking this medication. A healthcare professional will be able to advise on the safest option for you
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What is the difference between Feminax Ultra and Feminax (Express)?
Feminax Ultra contains naproxen 250mg, which is a longer-acting NSAID offering relief for up to 8–12 hours per dose. This means fewer tablets are needed throughout the day. Feminax (Express) contains ibuprofen lysine, which works more quickly but for a shorter duration, requiring doses every 4 hours. Feminax Ultra is generally better suited to women who want sustained, all-day relief, while Feminax Express may be preferred for faster-acting, on-demand relief. Both are available to purchase through our pharmacy following a short consultation.
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