What does visine do if added to a drink?

Visine contains the active ingredient tetrahydrozoline, which is a vasoconstrictor that reduces redness in the eyes. If added to a drink, it can cause nausea, vomiting, and other serious health issues. Additionally, using Visine inappropriately can be dangerous and is considered a form of poisoning. It's important to use medications only as directed and for their intended purposes.