 Dopamine is the hormone that's responsible within the confines or the constraints of ADHD. It's a dopamine issue, generally. There's more issues than that. But just from a hormonal perspective, we're talking dopamine. And so the drugs are trying to increase dopamine levels within the synapses. That's what the drugs are doing for ADHD. Depression is serotonin. And the drugs are trying to increase serotonin within the synapses.