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Mefenamic Acid

Mefenamic Acid

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Mefenamic acid tablets are non-steroidal anti-inflammatory drugs (NSAIDs) to relieve period pain. Mefenamic acid kills the pain for up to eight hours, and it's incredibly effective for women suffering from extreme discomfort due to their period. It's suitable for adults and teens aged 14 years and over and contains the active ingredient mefenamic acid.

  • Used to treat period pain
  • Mefenamic acid tablets can reduce bleeding
  • Faster acting than conventional painkillers
Period Pain
Women's Health
Price
£32.99

Mefenamic Acid

Strength: 500mg

Pack Size: 28

£32.99

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Mefenamic acid belongs to the same group of drugs as ibuprofen – non-steroidal anti-inflammatory drugs. They are better at reducing pain than over-the-counter medications and have proven to be effective in managing symptoms of period pain.

There is always a risk of side effects with all medications. Some of these can be quite mild and can subside over time. Others are more serious and should be reported to your GP right away if you experience any side effects. Please contact a member of our team if you are concerned about any potential side effects that may occur when taking mefenamic acid.

Some common side effects reported with mefenamic acid use include:

  • Swelling of the hands and feet
  • Skin reactions
  • Diarrhoea
  • Nausea
  • Vomiting
  • Fatigue
  • Headache
  • Photosensitivity
What are mefenamic acid 500mg tablets?

Mefenamic acid is a nonsteroidal anti-inflammatory drug (NSAID), which is the name for medicines that are used to treat mild-to-moderate pain and inflammation. Mefenamic acid tablets are usually taken to provide relief from period pain (dysmenorrhoea), reduce the symptoms of heavy periods (menorrhagia), and treat migraines caused by periods.

How do mefenamic acid 500mg tablets help to relieve period pain?

Mefenamic acid relieves period pain by blocking the production of prostaglandins, which are hormones released by your womb before and during your period. Prostaglandins cause your womb to contract, and if too many are released then these contractions can become painful. Mefenamic acid causes fewer prostaglandins to be released.

How does mefenamic acid help to stop heavy periods?

Heavy periods, like period pain, can happen when your womb releases too much of the hormone prostaglandin. Mefenamic acid blocks the production of this hormone, causing your periods to become lighter. Mefenamic acid has been shown to reduce heavy bleeding by between 20 to 50%.

How long does it take for mefenamic acid to relieve period pain?

Mefenamic acid takes between 2 - 4 hours to kick in and start easing your period pain. Each 500mg dose of mefenamic acid kills the pain for up to 8 hours, so you may need to take it two or three times a day for all-day relief.

Leaflets

Before you buy mefenamic acid online, regardless of whether they are over-the-counter or prescription-only, it is essential always to read the patient information leaflet.

Patient Information Leaflet

Umar Razzaq, MPharm | University of Strathclyde, Clinical Pharmacist.
Content Written by:Umar RazzaqMPharm | University Of Strathclyde
Date Written:01/03/2024
Role:Clinical Pharmacist
Nish Fayyaz, MPharm | University of Strathclyde, Pharmacist.
Medically Reviewed By:Nish FayyazMPharm | University Of Strathclyde
Date Checked:30/05/2025
Role:Pharmacist
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