How long can I take naproxen?

The issue, as with any NSAID, is dosage more than time frame. With Naproxen, the MAXIMUM allowed dosage is 1370mg/24hrs.
I've been taking NSAIDS for multiple injuries, causing chronic pain in multiple joints, for a long time. I have hit the upper limits of ibuprofen, Celebrex, Naproxen, and Arthrotec over the years... my hypertension doesn't like opioids for more than 1-2 doses at a time.

If you're taking more than about 1000mg of naproxen in 24hrs, you don't want to go long term. Not only does it add to liver and kidney damage, it'll add to the odds of a stomach ulcer or GI bleeding (what mine developed into).

I've been taking it a few years, speck to your doctor about it, if its working for you I'm sure he will leave you on it.

I have been on Naprosyn 500mg 2 times a day for a few years now. I had been on another anti inflammatory before this for a while that stopped working. It depends on how your stomach or body handles it,or how long your doctor thinks you need to take it.