While Adderall is effective in managing ADHD and narcolepsy, it also carries potential side effects. Common side effects include insomnia, increased heart rate, dry mouth, and loss of appetite. More severe reactions, such as high blood pressure, anxiety, or dependence, may occur with prolonged use. Due to its stimulant nature, Adderall should only be taken as prescribed and avoided by individuals with heart conditions or a history of substance abuse.