How much listerine is fatal?

The amount of Listerine that could be fatal varies depending on individual factors such as age, weight, and overall health. Listerine contains alcohol, and ingesting large quantities—typically several ounces—can lead to alcohol poisoning, which can be life-threatening. It's important to remember that Listerine is intended for external use and not for consumption. If someone has ingested a significant amount, they should seek medical attention immediately.