Naproxen
"I have been taking these for last few days for back pain and had no effect on the pain.  However, I have had dreadful nausea and felt strange and depressed all week. I never feel like this and just decided to stop taking the tablets this morning to see if that made any difference.  I have been totally fine since I stopped taking these tablets.  I think people need to be careful taking these tablets as the side effects can really wreck your head and stomach."