mouthwash

Q: The Listerine mouthwash that has alcohol in it, is it permissible to use and if you swallow some by mistake is it the same as consuming alcohol and do you get a sin.

Q: I have brought home a mouth wash. I used it today in the morning then I read at the back that one of the ingredients to make mouth wash is alcohol. These days every medicinal syrup uses alcohol as one of its ingredients. Should I use this mouth wash or throw it away?