I believe Naprosyn (Naproxen) is an anti-inflammatory that is just for the pain and inflammation from arthritis....like the different NSAIDS that are available.
I took it years ago when it first came out, and was trying it for my pain. It worked okay for me for awhile, but eventually my pain got worse and it didn't touch it anymore. And we had to move onto something stronger.
I do not think that it's a treatment for your symptoms of Lupus, or any auto-immune disease...meaning it's not designed to try to get your AI into a remission, it's just meant for the pain and inflammation that comes with an AI disease attacking your joints.
The treatments available are more along the lines of Steroids (Prednisone), Plaquenil, Methotrexate, Cellcept (if there's kidney involvement, I believe), etc.
I'm not positive about this, but I googled Naprosyn, and it identified it as an NSAID.
Hope this helps.....and most important, hope your doctor can diagnose you soon, so a proper course of treatment can be found.
I'll be hoping.....