Several different forms of medication exist for treating ADHD. Stimulants, including Ritalin and Adderall, are very common among children with ADHD. The drugs do have side effects, including sleeplessness, potential growth problems, stomach pain, headache or depression. Strattera is the first non-stumlant drug approved for ADHD, and it works by increasing levels of select chemicals in the brain. Antidepressants have also been used off-label to treat ADHD.