I stopped the med early November. I had terrible episodes of anger and aggression to the point of rage while on sulfasalazine. It affected my work and my home life. I felt as though I needed to crash the car to relieve the extreme anger and aggression. Initially this would escalate every 6 weeks and I felt i was going crazy as my rheumatologist and GP said the emotional upheavals were not side effects. Mindfulness, anger management on line, meditation and music to calm the chakras did help, but there was the possibility of eruption under the surface. It cost me my job. I found patient support groups (google search: anger and aggression with sulfasalazine) in which many others had the same side effects. After stopping the med, speaking once again with my GP and rheumatologist, I feel as though a black cloud has been lifted. I am starting to feel the physical effects of NOT taking it, but I would rather have the pain, and steroid injections than having pent up rage. Pfizer was the only company who listed mood changes as a side effect. I also filed an official untoward side effect for the data base.