I would obviously use the fentanyl test strip before moving on to this step. But that’s definitely safer than just downing the whole thing and hoping for the best and winding up in some kind of phenazepam adventure. Generally all “xanax” pressed tablets contain some RC or combination of them so it’s best to use caution. If they work they work though best of luck.Most xanax bars are fake these days. At least where I live, the only alprazolam comes in round tablets, we haven't had brand name xanax in a long time. So yes I generally assume all xanax is fake but that doesn't mean its worthless. Start by taking a small amount (like 1/4 or even less) to test potency.