Is it harmful to drink coffee if you have Attention Deficit Disorder - ADD?

it wouldn't be harmful but caffeine in coffee is a stimulant and would not impove the behaviour!

actually, people that are ADD/ADHD-PI: attention deficit hyperactive disorder(predomaintly inactive) are not hyperactive naturally so giving them coffee would probably make them hyper like anyone else, HOWEVER for some reason when you give ADHD(THE HYPERACTIVE TYPE) people coffee it calms them down