Any meds without this? | ADHD Information

My son has been on a few meds - all had depression and no appetite side effect. The no appetite is the worse - 43 lbs at 7 years old. Is there any meds that dont have that side effect? Or is that the magic drug that dont exist? Wellbutrin (bupropion) is said to have only slight if any effect on appetite--for food that is: some trails with adults found that it enhanced sexual appetite.  Wellbutrin is an anti-depressant but a side-use is for adhd also