What is Mefenamic Acid and what does it treat?
Mefenamic Acid is a pain-relieving medicine that belongs to a group of medicines called non-steroidal anti-inflammatory drugs (NSAIDs). It works by reducing substances in the body that cause pain, swelling, and inflammation.
When used for period pain, it helps relieve the cramping pain and discomfort caused by menstrual periods. It can also help reduce inflammation linked to menstrual pain.
It can help with:
- Period pain (menstrual cramps)
- Lower abdominal pain linked to periods
- Backache associated with menstruation
- General discomfort caused by painful periods
Active ingredient: Mefenamic Acid
Who is Mefenamic Acid suitable for?
This is a prescription-only medicine and must be taken exactly as advised by your prescriber.
Mefenamic Acid is suitable for:
- Adults aged 18 years and over who have been prescribed it for period pain
Mefenamic Acid should not be taken by those who:
- Are under 12 years old
- Are allergic to mefenamic acid or any other ingredients contained in this medication
- Have a history of stomach ulcers or stomach bleeding
Important information:
- Avoid drinking alcohol while taking this medicine, as it can increase the risk of stomach irritation and bleeding
- This medicine may cause dizziness, drowsiness, tiredness, or blurred vision
- If affected, do not drive or use machinery
Pregnancy warning:
- During the first 6 months of pregnancy, only take it if your doctor says it is necessary
- From 20 weeks onwards, prolonged use may harm the baby’s kidneys or heart
- Do not take it in the last 3 months of pregnancy
How to take Mefenamic Acid
Use exactly as directed on the label or as advised by your prescriber.
Typical use:
- Take the medicine during or straight after food to help protect your stomach
- Swallow the tablet whole with a full glass of water
- Do not chew or crush the tablet
- Use the lowest effective dose for the shortest time needed to control symptoms
Important advice:
- Take this medicine exactly as prescribed
- Treatment is typically initiated when period pain begins
- Do not take other NSAID painkillers, such as ibuprofen or naproxen, unless advised by a doctor or pharmacist
- Stop taking this medicine and seek medical advice if you develop severe stomach pain, vomit blood, or pass black stools
If you forget a dose:
- Take it when you remember, unless it is nearly time for your next dose
- Do not take a double dose to make up for a missed one
If you take more than you should:
- Call 111 and explain to them how much you have taken - 111 will advise on next steps.
How to store Mefenamic Acid
- Store below 25°C
- Keep the medicine in its original packaging
- Keep out of the sight and reach of children
- Do not use after the expiry date printed on the packaging
Like all medicines, Mefenamic Acid can cause side effects, although not everyone gets them.
Common side effects:
- Stomach pain, indigestion, or heartburn
- Feeling sick or being sick
- Diarrhoea or constipation
- Dizziness, drowsiness, or feeling tired
- Headache
- Loss of appetite
- Bloating or wind
Stop using and seek medical advice urgently if:
- You vomit blood or pass black stools
- You develop severe stomach pain
- You develop signs of an allergic reaction such as swelling of the face, lips, or throat
- You have difficulty breathing
Seek medical advice the same day if you notice:
- Unusual bruising or bleeding
- Yellowing of the skin or eyes
- Passing much more or much less urine than usual
- Swollen ankles, shortness of breath, or chest discomfort
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