The right medication and dosage will let your child’s personality shine through. If they are dulled, it’s the wrong medication or too high a dose.
As for the appetite issue, my son took Cyproheptadine with his stimulant for a couple years and gained normally. It’s a common medication to be prescribed with stimulants just for this reason. It’s an old allergy medicine that really isn’t used for that any more because it makes people gain weight.
Work on giving him calorie-dense foods when he is hungry, and let him eat when he’s hungry, even if it’s not meal time.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism