phatass
Bluelighter
Rohypnol 

What do you actually want the drug to do?
Why are you even planning on taking it on a first date?
Stimulants tend to be euphoric and will lower your inhibitions but the downside is you'll spout pure drivel at 300 miles per hour and even if she's not put off by you being a scary-looking, egomaniacal sweatball and things turn intimate you'll be looking for your penis with a microscope :D
I think its a must to be sober if your actually going out to find someone amazing that you want to connect with, true love![]()
I'd take some acid, but thats just me. %)