osteoarthritis
"After taking one pill twice per day for three weeks I suddenly experienced in the middle of the night an excessive amount of blood being discharges with diarrhea.  This continued every two to three hours until mid-morning when I was admitted to a hospital.  I was dx with diverticulosis and admitted over night.  Was treated with antibiotics.  The bleeding stopped by midafternoon.  The following day I was discharged and then went to see my family Dr.  He did not believe that I had diverticulosis as I had NO pain associated with the episodes.  After reviewing my meds he told me I should contact the prescribing Dr(knee specialist) regarding the episode and continuing the meds for pain.  I was told by the surgeons nurses to stop the meds."