Mefenamic acid expiry date?

Mefenamic acid—a non‑steroidal anti‑inflammatory drug (NSAID) commonly sold as 125 mg or 250 mg tablets—has a typical shelf life of 2–3 years when stored under normal conditions (room temperature, dry place, away from direct sunlight).

Key points to keep in mind

1. Expiration date on the package – The expiry date printed on the bottle, blister pack, or box is the official limit set by the manufacturer and regulatory bodies (FDA, EMA, etc.).
2. Do not use after expiry – Beyond the expiration date, the drug may have reduced potency or could have degraded into potentially harmful by‑products.
3. Storage matters – Even within the shelf life, storing mefenamic acid in a damp or hot environment can shorten its effective life. Keep it in a cool, dry place and keep the container tightly sealed.
4. If you’re unsure – Check the packaging for the “Best Before” or “Use By” date. If you can’t locate it or if the drug looks discolored, has an odd odor, or has changed texture, it’s safest to discard it and get a fresh supply.

If you have a specific batch or pack and want the precise expiry date, just look at the date printed on the label. If you’re still in doubt, a pharmacist can verify it for you.