A few drops of Visine in someone's drink causes diarrhea.

  Some people have heard that slipping someone a "Visine mickey" will give them a bout of sudden, but harmless, diarrhea.

  Visine does NOT cause diarrhea. But people have been severely harmed after ingesting Visine as part of a practical joke.

  The active ingredient tetrahydrozoline is a vasoconstrictor found in several OTC eye drops (Visine, Murine Tears Plus, etc). Swallowing even small amounts can lead to seizures, cardiovascular collapse, and coma.

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