Mefenamic Acid 500mg Tablets

  • Availability

    In Stock

  • Can reduce bleeding
  • Offers relief from period pain
  • Fast acting

Mefenamic Acid 500mg Tablets

From £37.99

Medication features

Mefenamic acid is a non-steroidal anti-inflammatory drug or NSAID. It is useful in the treatment of period pain.

Please note: This page is only to be used as a reference of our price for this medication. If you are approved you will be offered treatment for you and the prescriber to jointly consider. However, the final decision will always be the prescriber's.
NOTE: After selecting this product, you will need to complete a short assessment, so we can make sure this medication is suitable for you.
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  • Overview

    What is Mefenamic Acid?
    Mefenamic acid is one of the groups of medicines called non-steroidal anti-inflammatory drugs. It is used to relieve many different kinds of pain or discomfort but primarily for relief of period pain. It can also be prescribed to women after childbirth.


  • How does Mefenamic acid work?

    Mefenamic acid contains an active ingredient which targets the pain or inflammation in your body to relieve it.

  • What are the benefits of taking Mefenamic acid?

    Periods vary from woman to woman but for some women, they can be an extremely uncomfortable and painful experience that last for a prolonged amount of time.

    Taking Mefenamic acid to relieve this pain allows women to go about their daily life, whatever stage of their menstrual cycle they’re in.

  • How do I use Mefenamic acid?

    Mefenamic acid is a prescription-only medication. Always follow the advice of your doctor and read the patient information leaflet provided in the medication packet.

    Swallow the tablets whole with a drink of water - do not crush or chew them. It’s recommended to take these tablets during or just after a meal, and your dose will be decided upon by your doctor, based on the type and severity of the condition you’re trying to treat.

  • How do I buy Mefenamic acid online?

    You can safely buy Mefenamic acid online at Cloud Pharmacy. You will first need to have an online consultation with our medical doctor before your order will be supplied. The online consultation will ensure that Mefenamic acid is the right medication for your medical condition.

    Mefenamic acid is often used to relieve the pain and discomfort of a woman's period.

  • Side Effects

    Before taking Mefenamic acid, you should always first consult your doctor. You should not take Mefenamic acid if any of the following apply to you:

    • Are taking aspirin or other non-steroidal anti-inflammatory drugs for pain relief e.g. naproxen, diclofenac
    • Are in the last three months of your pregnancy
    • Have severe heart failure
    • Have a history of allergy to aspirin, ibuprofen or NSAIDs,
    • Have a history of stomach bleeding or perforation which may be related to the use of NSAIDs (naproxen,      ibuprofen, diclofenac) or aspirin
    • Are allergic to mefenamic acid or any other ingredients of this medicine
    • Have a history of, or active disorders of the stomach or intestines such as ulcerative colitis, Crohn’s disease, gastrointestinal cancers or diverticulitis
    • Have severe liver or kidney failure
    • Have recently had coronary artery bypass graft surgery
    • Are taking anticoagulants such as warfarin to prevent blood clots.

     Your prescription of Mefenamic acid may also be affected by a number of other factors, so you should make your doctor aware if any of the following apply:

    • Are taking antidepressants called selective serotonin re-uptake inhibitors
    • Are taking any other anti-inflammatory medicines including steroids
    • Have epilepsy
    • Regularly take a painkiller for headaches over a prolonged period
    • Have diabetes
    • Suffer from kidney disease and dehydration
    • Have systemic lupus erythematosus (SLE)
    • Are an older person
    • Suffer from asthma or have had a history of asthma
    • Have ulcerative colitis or Crohn’s disease
    • Are known to be a poor metabolizer of CYP2C9
    • Suffer from liver disease
    • Have heart problems, previous stroke or think you might be at risk of these conditions
    • Have a bleeding disorder or if you are going to have a major operation
    • Are taking any other NSAIDs (e.g. ibuprofen, diclofenac)
    • Are taking aspirin or medicines that thin the blood
    • Have a problem with the metabolism of sugar in your body

    Like many medications with active ingredients, Mefenamic acid can affect or be affected by other medicines. Particular medications that you may experience this with include the following:

    • Probenecid used in the treatment of gout
    • Zidovudine which is used in the treatment of AIDS and HIV infection
    • Anti-platelet agents (used to prevent blood clots)
    • Mifepristone
    • Cyclosporin
    • Antihypertensives and ACE inhibitors, used to treat high blood pressure
    • Certain medicines used to treat heart conditions known as cardiac glycosides
    • Low dose aspirin (75mg) to help prevent heart attack or stroke
    • Corticosteroids,
    • Certain medicines for depression such as lithium
    • Methotrexate
    • Quinolone antibiotics
    • Diuretics such as hydrochlorothiazide
    • Tacrolimus which is used to suppress the immune system
    • Aminoglycoside antibiotics
    • Some diabetic medicines such as (e.g. glipizide, glibenclamide).

    If you are taking any of the above medications, then you should make your doctor aware so that they can advise whether or not Mefenamic acid will be the best course of action for you.

    If you are pregnant then you should consult your doctor before taking Mefenamic acid. It is definitely not suitable for those in the last 3 months of pregnancy, but affects on the baby in the first 6 months are not known. This means it’s not usually recommended but your doctor may prescribe it you if they feel it necessary. However, you should not take Mefenamic acid if you are trying to get pregnant, as the drug will make it more difficult.

    If you are breastfeeding then you should be aware that Mefenamic acid can be passed into your breast milk and should therefore not be taken during this time unless expressly instructed to do so by your doctor.

     The most common side effects of using Mefenamic acid include:

    • Oily stools
    • Stomach ache, indigestion, abdominal pain/discomfort
    • Feeling sick (nausea), vomiting, loss of appetite
    • Diarrhoea or constipation, wind
    • Sore mouth and/or lips
    • Blood in the stools or urine
    • Inflammation of the pancreas, stomach, small intestine or colon

    If you do experience one or more of these side effects and they persist or worsen, then inform your doctor right away. You should also contact your doctor immediately if you experience any serious side effects, such as vomiting blood, severe skin reaction, or difficulty breathing.