Mefenamic Acid can relieve the pain and discomfort caused by: arthritis, headache, toothache, periods, and may also be used after operations and childbirth.
Mefenamic Acid is often prescribed under the brand name, Ponstan for period pain. Ponstan belongs to a group of medicines called non-steroidal anti-inflammatory drugs.
The usual adult dose of Mefenamic Acid (Ponstan) is 2 capsules taken 3 times a day. However, your doctor may suggest a different dose. Follow your doctor's instructions exactly and never change the dose yourself.
Your doctor will have decided what dose of Mefenamic Acid is right for you.
Always take the capsules with plenty of water, preferably after a meal. Try to take them at the same times every day.
Mefenamic Acid can sometimes cause side-effects. These might be:
- skin rash
Other side effects have also been reported with Mefenamic Acid, these are shown below. If you suffer from any of the side effects listed, or any other side effects, stop taking the capsules and tell your doctor or pharmacist immediately.
- Stomach: Upset stomach, nausea (feeling sick), vomiting, stomach pain, black tarry stools (bowel motions).
- Blood: Anaemia, increased bruising or bleeding, frequent sore throats or infections. Mefenamic acid can reduce the number of certain types of blood cells. If you have any blood tests performed, you should remember to tell the doctor that you are taking mefenamic acid.
- Liver: Yellowing of the skin and eyes.
- Kidney: Red urine, protein in the urine (you cannot see this but your doctor may test for this from time to time).
- Other: Recurring or persistent headache, dizziness, drowsiness, puffiness of the face. allergy
Take Mefenamic Acid Capsules with caution if:
- You have had an ulcer or some other problem affecting your stomach, or intestines
- You have asthma or wheezing attacks (or if you have had asthma in the past)
- You have any heart, liver or kidney problems
- You are elderly
- You suffer from epilepsy (fits)
- You suffer from any abnormality of the blood
- You are dehydrated (for example you have been losing fluid through vomiting, diarrhoea or passing too much or too little, urine (fluids)
- You have frequent headaches
- You drink alcohol
- You have a connective tissue disorder e.g. Systemic Lupus Erythematosus (SLE) resulting in joint pain, skin change and disorders of other organs
- You have a problem with the metabolism of sugar in your body
- You are trying to get pregnant.
Do NOT take Mefenamic Acid Capsules if:
- You currently have a stomach ulcer or bleeding
- You have suffered from stomach ulcers or bleeding two or more times in the past
- You suffer from inflammatory bowel disease
- You show any signs of allergy (such as asthma, hay fever or skin rash) to aspirin, ibuprofen or other NSAIDs.
- You have severe problems with your kidneys or liver
- You suffer from severe heart failure
- You had a major heart surgery
- You are in the last three months of pregnancy
- You are breast feeding.
The patient information leaflet (PIL) is a leaflet containing specific information about medical conditions, doses and side effects. You can download a copy of the PIL here:
Patient Info Leaflet