Mefenamic acid is used for the short-term treatment of mild to moderate pain from various conditions. It is also used to decrease pain and blood loss from menstrual periods.
Mefenamic acid is known as a nonsteroidal anti-inflammatory drug (NSAID).
- Upset, stomach, nausea heartburn, dizziness, drowsiness, diarrhoea and headache may occur. If any of these effects persist or worsen notify your doctor or pharmacist promptly.
- Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
- This medication may raise your blood pressure. Check your blood pressure regularly and tell your doctor if the results are high.
- Tell your doctor right away if any of these unlikely but serious side effects occur: fainting persistent/severe headache hearing changes (e.g. ringing in the ears ) fast/pounding heartbeat mental/mood changes stomach pain difficult/painful swallowing vision changes symptoms of heart failure (such as swelling ankles /feet unusual tiredness unusual/ sudden weight gain ).
- Stop taking mefenamic acid and tell your doctor right away if any of these rare but very serious side effects occur: easy bruising/bleeding signs of infection (e.g. fever persistent sore throat ) unexplained stiff neck change in the amount/colour of urine.
- This drug may rarely cause serious possibly fatal liver disease. If you notice any of the following rare but very serious side effects stop taking mefenamic acid and consult your doctor or pharmacist right away: persistent nausea/ vomiting severe stomach / abdominal pain weakness dark urine yellowing eyes/skin.
- A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction including rash itching /swelling (especially of the face/ tongue /throat) severe dizziness trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above contact your doctor or pharmacist.
- Before taking mefenamic acid tell your doctor or pharmacist if you are allergic to it; or to aspirin or other NSAIDs (e.g. ibuprofen naproxen celecoxib ); or if you have any other allergies. This product may contain inactive ingredients which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
- This medication should not be used if you have certain medical conditions. Before using this medicine consult your doctor or pharmacist if you have: aspirin-sensitive asthma (a history of worsening breathing with runny/stuffy nose after taking aspirin or other NSAIDs severe kidney disease recent heart bypass surgery (CABG) active bleeding/sores in stomach/intestines (ulcer gastrointestinal bleeding).
- Before using this medication tell your doctor or pharmacist your medical history especially: asthma bleeding/clotting problems blood disorders (e.g. anaemia) high blood pressure diabetes heart disease (e.g. history of heart attack ) liver disease growths in the nose ( nasal polyps ) obesity tobacco use history of stomach /intestine/oesophagus problems (e.g. bleeding ulcers recurring heartburn ) stroke swelling of the ankles /feet/hands.
- Kidney problems can sometimes occur with the use of NSAID medications including mefenamic acid. Problems are more likely to occur if you are dehydrated have heart failure or kidney disease are an older adult or if you take certain medications (see also Drug Interactions section). Drink plenty of fluids as directed by your doctor to prevent dehydration and tell your doctor right away if you have a change in the amount of urine.
- Before having surgery tell your doctor or dentist that you are using this medication.
- This drug may make you dizzy or drowsy. Alcohol or marijuana ( cannabis ) can make you more dizzy or drowsy. Do not drive use machinery or do anything that needs alertness until you can do it safely. Avoid alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).
- This medicine may cause stomach bleeding. Daily use of alcohol and tobacco especially when combined with this medicine may increase your risk for stomach bleeding. Limit alcohol and stop smoking. Consult your doctor or pharmacist for more information.
- This medication may make you more sensitive to the sun. Limit your time in the sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you get sunburned or have skin blisters /redness.
- Kidney function declines as you grow older. This medication is removed by the kidneys. Therefore caution is advised when using this drug in the elderly because they may be more sensitive to its side effects especially stomach bleeding and kidney problems.
- Before using this medication women of childbearing age should talk with their doctor(s) about the benefits and risks (such as miscarriage trouble getting pregnant ). Tell your doctor if you are pregnant or if you plan to become pregnant. During pregnancy, this medication should be used only when clearly needed. It is not recommended for use during the first and last trimesters of pregnancy due to possible harm to the unborn baby and interference with normal labour/delivery.
- This drug passes into breast milk and may have undesirable effects on a nursing infant. Consult your doctor before breastfeeding.