ADHD can be treated as a character flaw—"laziness." You can guess how effective this method usually is. Then there are organizing tricks that people with ADHD can be taught to reduce distractions, and psychological therapies that can diminish their underlying anxiety. The most popular treatment, of course, makes use of drugs, which are easy to give and fairly likely to be effective. Remarkably, response to medication doesn't seem to depend on whether the cause of the ADHD is neurochemistry, anxiety, or boredom and distraction. There are several different kinds of drugs used to treat ADHD, and sometimes patients respond to one class but not another. Stimulant medications are the most popular and most likely to be effective.