|Molar mass||200.28 g/mol|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetrahydrozoline is an alpha agonist and its main mechanism of action is the constriction of conjunctival blood vessels. This serves to relieve the redness of the eye caused by minor ocular irritants.
An urban legend suggests that tetrahydrozoline can cause violent diarrhea if administered orally, such as by putting a few drops of Visine in an unsuspecting person's beverage. However, the actual results of the "Visine Prank" may be worse, varying from severe nausea and vomiting to seizures or a coma. Diarrhea is not a side effect.
- Dahlström M; Lindgren F; Berntsson K et al. (July 2005). "Evidence for different pharmacological targets for imidazoline compounds inhibiting settlement of the barnacle Balanus improvisus". J. Exp. Zoolog. Part a Comp. Exp. Biol. 303 (7): 551–62. doi:10.1002/jez.a.163. PMID 15945078.
- "Visine Prank: Mickey Red Eyes". Snopes. 29 June 2009. Retrieved 28 July 2010.
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