rheumatoid arthritis
"The first two-three weeks were fine.   Then I started experiencing a bad headache, the next two days fever and chills.    The next evening, severe chills, weakness, dizziness, raging fever (up to 104.3) and began throwing up.    It was the worst I've ever felt in my life (and that includes a hospitalization in ICU when first diagnosed).    I was on the verge of calling 911.   However, it eventually passed (as the medicine worked its way out of my system) and the fever subsided.   My Rheumatologist ran a complete series of blood work and she said that I had an allergic reaction.   Prior to starting Imuran, I had been tested for liver compatibility and the results showed that I would have no issues so I proceeded.  Proceed w/extreme caution."