You don't mention when the medication expired. Expired medicine losses effectiveness over time. If it is just expired then it should still help. I usually don't use over the counter medicine if it is more than 3 months after the expiration date. I find it doesn't help much at that point.
- Naproxen Information for Consumers
- Naproxen Information for Healthcare Professionals (includes dosage details)
- Side Effects of Naproxen (detailed)
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