Listerine contains 26.9% alcohol (54-proof) which is higher than the alcohol content found in most beer, wine, and even some liquors.
Consuming Listerine can cause intoxication or even alcohol poisoning if too much is consumed in a short period of time.
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Original formula Listerine is 26.9% alcohol, making it approximately 54 proof. According to the US, one "standard" drink contains roughly 14 grams of "pure" alcohol—so one standard drink of Listerine is 2.2 fl. oz. (so there are about 23 standard drinks in one 1.5 L bottle of Listerine)
Can You Get Drunk By Listerine or Will It Kill You? - Spoon University
Yes; the popular Listerine mouthwash is 26.9% alcohol. In fact a number of household liquids contain alcohol and can be used to get drunk, including hand sanitizer, hair spray, and perfume. Using mouthwash or other substances, however, can cause serious bodily harm.
Mouthwash and Alcoholism: Dangers of Drinking Listerine Alcohol