Mefenamic Acid

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  • Period Pain
  • Pain associated with heavy menstrual bleeding

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  • Genuine Medicine Approved by MHRA
  • Regulated NHS & Online Pharmacy
  • Free Delivery for orders above £30
  • Free Private Prescription included


What is Mefenamic acid?

Mefenamic acid is a non-steroidal anti-inflammatory pain relief drug that has been shown to help limit and manage prostaglandin activity. It can help to relieve pain that is experienced while on your period.

How does Mefenamic acid work?

Mefenamic acid helps to relieve pain through its anti-inflammatory properties and its limiting of prostaglandin activity. Prostaglandins are chemicals that actually encourage the womb muscles to contract, which often leads to more serious pain. By limiting prostaglandin activity period pain can be reduced.

How should Mefenamic acid be taken?

Mefenamic acid 500mg tablets should be taken as you would usually take painkillers – at the onset of the menstrual pain. Follow the directions that have been outlined in your prescription to determine how frequently you should take the medication. Mefenamic acid should ideally be taken either with or after food.

Is Mefenamic acid suitable for me?

Mefenamic acid is not suitable for those who have a bowel disorder such as IBS, a history of asthma attacks after taking aspirin or NSAIDs (non-steroidal anti-inflammatory drugs), an active ulcer or bleeding in the stomach, or kidney disease. You should not take Mefenamic acid if you are allergic to any of its ingredients.

Side effects

Like all medicines, this medicine can cause side effects although not everybody gets them. Some of the possible side effects:

  • Disturbances of the gut such as indigestion, diarrhoea, constipation, nausea, vomiting or abdominal pain.
  • Headache.
  • Dizziness.
  • Drowsiness.

Please refer to the patient information leaflet for more information.

More information

Click on the link below to view product patient information leaflet: