(含兴奋剂,运动员慎用)帮忙翻译成英语

楼上几位说的是中式英语。你没给上下文，我猜是用在药瓶标签上的。我在美国生活十年了，根据我的理解应该这样说：

This drug contains a performance-enhancing ingredient. Use it with caution if you are an athlete. 实际上，“兴奋剂”是一个泛词，所以你做好把这种成分的名词带出来，好比说是steroid，就说：The drug contains steroid, a performance-enhancing hormone.

It contains stimulants,athletes should cautiously use them.

athletes be careful!
Including incitant.

Stimulants included. For cautious use by athletes

Including stimulants, anti-Athletes