6 Nov 2011
I realize this answer is very late but may be useful in future.
Naproxen has an elimination half life of 12 to 17 hours.
It takes 5.5 x elimination half life for a medicine to be cleared from ones system. So it'll be in your system for about 93.5 hours (5.5 x 17 hours).
- Naproxen Information for Consumers
- Naproxen Information for Healthcare Professionals (includes dosage details)
- Side Effects of Naproxen (detailed)
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