Quote Originally Posted by rekoms htlaets
If you look at the ingreidients you see that Listerine and most mouthwashes contain SD Alcohol. The SD stands for specially denatured. Sd alcohol is still capible of causing intoxication. However the denaturing process is utilised to make the alcohol undrinkable for that purpus in order to avoid the alcohol tax.
In some products, denatured alcohol is actually safe to drink. The difficulty is that most companies do not produce information on how their alcohol has been denatured. I have heard that Listerine (not other mouthwashes) contains non-toxic denatured alcohol, though I have not had any desire to see whether it is true or not.

tgm1995, the only safe way to do it would be to distill it under controlled conditions. This is not trivial, as you must control the temperature and collection to avoid methanol and other toxic products. Long story short, don't do it.