Several types and subtypes of medications are available to treat ADHD (attention deficit hyperactive disorder). The most prevalent prescribed treatment is with CNS stimulatory drugs (stimulants) which include methylphenidate (MPH) and amphetamines. Although not fully understood, MPH unique mechanism is believed to contribute to its high effectiveness in treating ADHD. However, initiating treatment and side effects which vary in prevalence and severity. The most common side effects include insomnia, nausea, vomiting, anorexia and anxiety. Furthermore, MPH has an abuse potential which may lead to more severe complications. Due to MPH shortcomings and risks, it should only be used when indicated and prescribed and preferably monitored by a physician.