Drug Information for a Novella.

[Joe.Nick]

Hello everyone, I come to you seeking to be informed and to learn.

I'm writing a novella, and in the story a girl gets into a sticky situation where two guys have her in a compromising position that she'd rather not be in.

In order to get out of this situation, my idea is to have the girl slip some type of drug into the bottle of champagne that causes the two guys to freak out and/or no longer feel like continuing on their current course of action(Of a sexual nature).

I have one problem with my story idea - I have NO idea about any drugs(Never taken any).

So if you, or a friend, could inform me of any type of drug that might fit the story, I'd really appreciate it.

1: Can be taken in a liquid.
2: Semi fast effecting.
3: Would put the two guys into a state that they'd no longer feel like abusing this girl.
4: A drug in low doses that doesn't last long.
5: A drug that has some(easily) obtained counteractive.

Are there any drugs that fit the above?

Thanks.