Thrombocythemia
"Bad side effects (or what I would consider bad side effects and not to be tolerated) - 71 year old female, 58 kgs:   been taking 500 mg a day for approx 2 and a half months.  Recently experienced fever, chills, headaches, muscle aches, extreme tiredness, lack of appetite - enough that I could not function and spent days in bed.  Waited 5 days, took another dose and was back in the same position the next day.  Decided to stop medication for next few weeks.  Blood test due in 2 weeks and see Specialist in December."