you're name made me raise my eyebrow, my really close friend made one of his social media names "(his name)apam" in homage to clonazepam. He was always saying "oh its just a funny screen name, I don't even take it that much" and he'd joke that he was just trying to be edgy. At the end he had been to rehab 3x for alcohol and various benzos, finally for IV clonazolam, and that one did him in.
For IQ, drugs aren't really going to destroy your IQ like that.........generally speaking, taking too much probably wont make you dumb. at least not permanently. There are special circumstances, like a severe overdose leaving your brain starved of oxygen long enough to cause brain damage, but this is something that benzos dont normally do, even in big stupid doses. taking huge doses of drugs that cause respritory depression, that are neurotoxic, or that mess with nerve transmission or other stuff like that are the only ways I can think of off the top of my head that would drop your IQ the way you took your xanax.......single large use.
BUT, xanax and other benzos are notorious for making people feel dull, dead, and zombie like when they take them long term. Since benzos, especially xanax, have amnesiac properties, they really fuck with your short term memory and your ability to hold info for long periods of time.......the ability to remember. Long term use will make your IQ drop because you will find dificulty remembering things from really long ago, and things from when you were taking the benzos..........and if you get to chronic use that could be a pretty big chunk of time living in the fog.
I guess the point is......................single use will not drop your IQ, but be very very wary of using too much and ending up in a daily use cycle. Its easier to get there than you think and very hard to get out of it