If your on vioxx or celebrex watch for neurological changes such as dizziness, lightheadedness, and even loss of consciousness. I work at a hospital in a neuro dept. and have noticed a lot of people are comming in for these problems and are on these meds. A friend of mine who is an RN had a blackout and shes sure it was the vioxx that did it. No problems since she went off of it. Vonnie