Noun:

1. a drug that temporarily quickens some vital process

Adjective:

1. (of drugs e.g.) able to excite or stimulate

stimulantn.兴奋剂；刺激物；酒精性饮料adj.使兴奋的；激励的；鼓舞的

excitativeadj.刺激性的； 激发 ... 的； [电]励磁的

stimulant drug兴奋剂; 兴奋药

excitatoryadj.刺激性的； 激发 ... 的

1. He has been forbidden playing for one year because of excitant.
   他因服用兴奋剂被罚停赛已有一年了。