Dear Madame L,
I've heard that people have put a few drops of Visine in someone's drink to get revenge or just for a harmless prank, but I've also heard this can be dangerous.
I looked it up online and found out it really is very dangerous, can cause death and at the least very severe illness which takes a long time to recover from. Will you please spread this information to your readers?
Thanks for sharing this information. This is indeed extremely dangerous, and people who have done it to other people, for whatever reason, have been arrested for and convicted of crimes such as assault and attempted murder.
Please check this Snopes.com article for more details. Meanwhile, remember, putting any harmful agent into another person's food or drink is called poisoning. It's not funny, and it can cause permanent harm.