The approved naproxen sodium dosing in the U.S. is a single dose of 220-440 mg, with a dosing interval of ... Naproxen is not only consumed in case of arthritis, but also for muscle strain relief, ...

Stop taking naproxen and get emergency help right away if you have any of the following symptoms. Vomit blood Black or tarry poop Stomach pain that does not go away Upset stomach Feel faint Anemia.