Visine is a brand of eye drops produced by Johnson & Johnson. Johnson & Johnson acquired Visine, along with Pfizer's entire consumer healthcare portfolio, in December 2006. The active ingredients in the original Visine formulation are potassium chloride and tetrahydrozoline hydrochloride which is a vasoconstrictor, and therefore constricts the eye's superficial blood vessels to "get the red out", as claimed in Johnson & Johnson's advertising . Visine is administered topically with 1 to 2 drops applied to the affected eye(s) up to 4 times daily . A common urban legend is that a few drops of Visine in an unsuspecting victim's drink will cause a harmless bout of diarrhea. This will not produce diarrhea, but oral administration of Visine can induce dangerous side effects related to Visine's ingredient tetrahydrozoline hydrochloride such as: Pfizer recommends that anyone ingesting Visine get medical attention or contact a poison control center immediately.
Contributions by AED, StuRat, and 126.96.36.199.