Look, if you have a tolerance, which it sounds like you could possibly have a tolerance, possibly not, who the fuck really knows, since you didn't give us any information besides that you mixed 2 with 3 ativan, what the fuck does 3 ativan even mean? 1.5mgs or 6mgs? I'm not trying to be mean, but we need more information than your height and weight if you want advice. The least xanax I've ever needed to get high is probably 2mgs minimum and that's mixed with other shit. For the most part i wouldn't go by things I've done because you'll die, not only am I a big guy, but my liver was and should still be a champion among champions. But if you gave us lots of info regarding recent usage of substances and shit then maybe we could possibly be of some help if we want to be.