Here's why it's likely not a standard term:
* "Sedative" refers to a substance that calms or tranquilizes.
* "Contra-" often means "against" or "opposite."
Putting these together, "contrasedative" would logically mean something that *counteracts* the effects of a sedative.
Here's what could be happening:
* Misspelling: Perhaps the intended word was "countersedative," which is a more common term used to describe a substance that reverses the effects of a sedative.
* Specific Context: The term might be used in a particular field or research area, where it has a specialized meaning.
* Informal Use: It's possible the term is being used informally or colloquially, without a strict medical definition.
To understand the meaning accurately, you need more context. If you provide the source where you encountered this term, I can help you understand its specific meaning.