oh no, it IS impossible to overdoes on guaifenesin...it's a natural thing, like pot...you'll puke before you'll overdose on it...it'll all come up...it's nothing harmful at all....it's just that it does make many people puke...it's not a good combination with dxm because you might take too much of it and puke....but yeah it's harmless, basically you're eating bark off of a certain tree...