My son has been on Azathioprine since Feb 2017 when he was first diagnosed with Crohn's. On Sulfasalazine (because low cost for me vs other meds) too until Aza kicks in. Stopped taking Sulfasalazine twice to test if Aza was working, but no luck. He started bleeding again. We are now testing Aza a 3rd time by taking him off Sulfa starting 12/2 keep your fingers crossed.
He still doesn't eat much. He is 16 years old and he hasn't gotten his appetite back yet. He gets nauseous in the mornings and after gym. He recently developed a hand tremor in his right hand. I posted about it in this forum under the Parents with Kids with IBD. Besides that, no other side effect.
Since Feb, he hasn't gotten sick until now. I am taking him into PCP today for his sore throat. He may not have gotten sick until now maybe because the Aza wasn't working yet and his immune system was still on overdrive. In a way, I am kind of glad he finally got a cold. Maybe it is a sign that the medicine finally works?? Hopeful