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ADHD Medications For Adults and Teenagers Once the ADHD medication begins to work effectively, a person will be able to focus for longer periods. They may also be in a position to fall asleep faster. Adults are often prescribed stimulants for ADHD. They are available as immediate-release or long-acting. Long-acting formulations prevent "crash" effects that occur when stimulant medications wear off. Methylphenidate Methylphenidate is a central nervous system