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Central nervous system stimulant medicines are the most commonly prescribed medications to treat symptoms of attention deficit/hyperactivity disorder (ADHD). These stimulants activate the level of activity, arousal, or alertness of the central nervous system. They work by “stimulating” and increasing the availability of certain neurotransmitters in the brain, making pathways in the brain work more effectively. 中枢神经系统兴奋剂是治疗注意性缺障碍症（多动症）的一剂常用良方。这些兴奋剂提升了人们控制行为的能力，唤醒并使中枢神经系统处于警觉状态。这些药物的主要职能是“刺激”并增加大脑中某些神经递质的能动性，让大脑工作的效率更高。 All three subtypes of ADHD -- the Combined type, the Predominantly Hyperactive-Impulsive type, and the Predominantly Inattentive type -- respond to stimulant therapy. 共有三种亚型多动症：组合型多动症，冲动型多动症以及完全无法集中注意力为主要特征的多动症——刺激疗法都可以奏效。 Caffeine is also a central nervous system stimulant. Is caffeine an alternative therapeutic strategy for the management of ADHD symptoms? Can a few cups of coffee a day effectively improve mental focus and attention and reduce impulsive or hyperactive behavior in children with ADHD? 咖啡因也是中枢神经系统兴奋剂的一种。但这就意味着咖啡因能在治疗多动症方面取代药物么？一天喝几杯咖啡，我们就能集中注意力于工作了吗？也能使罹患多动症的儿童行为有所改善吗？ | 
