About mefenamic acid
Nonsteroidal anti-inflammatory drug (NSAID)
Used for
- Short-term relief of mild to moderate pain
- Menstrual pain and heavy menstrual bleeding
Usual adult dose
Pain: 500 mg three times daily, usually for no more than 7 days. Menstrual symptoms: 500 mg three times daily, starting with symptoms.
Usual dose in children
For children aged 14 years and older, usual adult dosing may be used. Not recommended under 14 years.
Common side effects
- Stomach pain, nausea, diarrhea, or indigestion
- Dizziness or headache
- Stomach ulcer or bleeding
- Kidney problems or allergic reactions
Important warnings
- Can cause serious stomach bleeding, ulcers, or bowel problems
- Avoid with other NSAIDs, such as ibuprofen or naproxen
- Use caution with heart, kidney, liver, or blood-pressure problems
- Stop and seek urgent care for chest pain, breathing trouble, or severe bleeding
Pregnancy
Avoid from 20 weeks unless specifically directed; avoid after 30 weeks because of fetal risks.
Breastfeeding
Small amounts may enter milk; short-term use is generally considered compatible, but discuss with a clinician.
Interactions
- Blood thinners, aspirin, and antiplatelet medicines increase bleeding risk
- Other NSAIDs or corticosteroids increase stomach complications
- Some blood-pressure medicines and diuretics may work less well
- Lithium and methotrexate levels may rise
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.