From March 2001 to December 2004, 617 took 200 milligrams of the NSAID celecoxib twice daily, 596 took 220 milligrams of naproxen sodium twice daily and 904 took placebo.
From the sciencedaily.com
For instance, medications which contain aspirin, ibuprofen, or naproxen sodium should not be taken because they are well known to have the side effect of prolonged bleeding.