Hey banana - I get headaches from time to time on Imuran. Sometimes pretty bad and can last a solid day or two. I can get very dizzy and ummm... well hard to describe. Lethargic perhaps.
Water does the trick for me. If I drink a LOT early and all throughout the day. Not sure if this would make a difference for you but it's pretty easy to and cheap to try at least ;) I usually have 2-3 full large glasses upon waking up. If I skip the water or don't eat properly as well the headache and dizziness type feeling starts.
I think it effects hydration - or it's important to pee clear while on it, haha.
EDIT - but I guess if it didn't happen before on your old stuff maybe it's a reaction to something used to make the pills themselves. Hmm.
Post Edited (Canada Mark) : 12/30/2014 5:38:42 PM (GMT-7)