Drinking eye drops, such as Visine, or beverages that have been laced with drops causes a number of harmful side effects, according to Healthguidance.org. Individuals, especially children, who ingest eye drops may experience a drop in body temperature and blood pressure fluctuations along with other complications.
Though it is sometimes regarded as a prank, putting eye drops in someone's drink can have dire consequences. Products like Visine contain tetrahydrozoline HCI, according to Healthguidance.org, and this substance is known to cause diarrhea, nausea, severe breathing difficulty, respiratory failure, tremors, blurred vision, seizures, coma and even death. Anyone who drinks eye drops is advised to seek medical attention or contact the Poison Control Center immediately.