It sounds like you are confusing ADHD meds, which are stimulants (basically speed) with benzos, which they give for depression/anxiety. First you have to understand what ADHD even IS, which is a lack of executive function. All that means is it is harder to know what to do out of the millions of things floating in front of your brain every second. Stimulants, which usually make people feel more wired, tend to make those with ADHD feel more calm. Because they aren't flitting between thoughts and the stimulant empowers them to have a more normal executive function to actively choose what to pay attention to.
Worth noting this feeling of calm comes solely as relief from spastic thoughts. Your body still responds in every other way as you would from taking a stimulant, and yet people feel calmer and more orderly because their baseline thoughts are so frenetic.
Worth noting this feeling of calm comes solely as relief from spastic thoughts. Your body still responds in every other way as you would from taking a stimulant, and yet people feel calmer and more orderly because their baseline thoughts are so frenetic.