中枢神经兴奋剂

烟碱又名尼古丁（nicotine）属于吡啶族生物碱，在烟草生物碱中烟碱是最主要生物碱，烟碱是一种中枢神经兴奋剂，吸食后使人产生生理和心理上的依赖性，是让人成瘾的物质。

Alkaloid of tobacco is also known as nicotine , belonging to pyridine alkaloids . Nicotine is the main alkaloid in tobacco , which is a central nervous stimulator , and addictive substance after taking , causing physical and psychological dependence .

在药理和毒力方面，蓖麻碱和许多中枢神经兴奋剂一样，在高剂量时会引起动物阵挛发作，呼吸抑制，甚至死亡，但在低剂量时，具有改善记忆的药理活性，还有肝保护作用。

As the properties of many central nervous system stimulants , Ricinine can cause clonic seizures of animals , respiratory depression , even death in high doses . However , ricinine can improve the memory or protect liver at low doses .

虽说被划定为镇静剂，酒精最初却是被当作中枢神经系统的兴奋剂。

Despite being classified as a depressant , alcohol initially acts as a stimulant on the central nervous system .

兴奋剂：能兴奋机体功能的药物。通常指刺激中枢神经系统的兴奋剂，用于警醒，改善心情，提神消倦，增加言语和运动能力，以及控制食欲。

Stimulant : any drug that excites any bodily function ; usually one that stimulates the central nervous system , inducing alertness , elevated mood , wakefulness , increased speech and motor activity , and decreased appetite .

咖啡因是中枢神经系统的强效兴奋剂，一杯咖啡中的咖啡因含量需要你花6个小时来消化。

Caffeine is specifically a central nervous system stimulant . It takes a total of 6 hours for your body to get rid of half the caffeine found in a cup of coffee .