hi shady,
I take ativan(lorazepam/a benzo) while on regular amphetamine(adderall and dexedrine) all the time. I've checked various web sites for interactions and I haven't found any.
I usually snort .5-1mg and it calms me down so that I can sleep, even if I'm still geeked. I always feel like absolute shit in the morning though when I do this. I never feel good when I wake up if I don't let the main effects of amp clear before I sleep.
In the amphetamine experience section at
http://www.erowid.org/experiences/exp.php3?ID=377 there's a nice write-up of someone who combined these two and found it to be a good combo. I find it to be great myself, it's a real mind-fucking experience especially if you smoke a little weed on top of it all.
My advice would be to limit it(ativan anyway) to .5-1.5mg. You'll be fine cause it reduces psychosis, panic, and anxiety associated with amphetamine use. Have fun.
...also, I should mention that the ER sometimes administers iv lorazepam for meth overdoses, so don't worry about interactions. Just take a LOW dose at first and if that isn't enough, take a LITTLE more. Just keep it low. In my experiences, I found that taking a low dose mellows me out a little, while saving the majority of the benzos(I'm limited in supply) for the next couple of days of hell on earth. If I didn't have benzo's for the comedown I don't know if I'd be alive right now. I know that sounds bad, but withdrawl sucks!
here's references to ativan to help calm meth/amp overdose:
http://www-clinpharm.medschl.cam.ac.uk/CPU_Clinical%20_Teaching/amphetamine.htm
http://www.emedicine.com/EMERG/topic23.htm
[This message has been edited by Dr_Rolls_MD[MA] (edited 02 June 2001).]