I was put on Zyprexa at 18 and put on a few stones of weight. Switched to Quetiapine at 21. I'd lost some of the weight but the quetiapine started to affect the way my thyroid works. There is nothing structurally wrong with my thyroid, but the quetiapine slows it down. So I take thyroxine. After ten years on quetiapine that happened. I am a size 14 (UK) so I'm OK. I will admit I drunk a lot in my 20's. Not so much now in 30's.

Lithium is usually the worst culprit for thyroid problems. I took lithium for a few months and it works. But came off it to increase mirtazapine and venlafaxine(now sertraline) instead. I used to only need one pill. Gradually had others added over the years. Risperidone didn't work for me. So geodon etc. would do nothing for me.