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ADHD Medications For Adults and Teenagers When the ADHD medication begins to function effectively, a person will be able to concentrate for longer periods. They might also fall asleep more easily. Adults are often prescribed stimulants for ADHD. They can be immediate-release or longer-acting. Longer-acting formulations are preferred because they prevent "crash effects" that occur when stimulant medication wears off. Methylphenidate Methylphenidate is a central nervous system stimulant. It is