I've done this quite a few times with my prescription pain pills over the years and am still alive/have healthy liver function. I pair it with a NAC capsule, when available, to be safe and try to space them out as much as I can but a few times they have been dosed closely. If I were you, I'd buy all the Excedrin ingredients separately and dose the acetaminophen as low as possible. Like Kastom says, it's not good for you even by itself.