The former tend to end up in medications used to reduce blood pressure. The latter, which includes tetrahydrozoline, often go into nasal sprays or in eye drop formulas that are designed to "get the red out. This is not, by the way, a simple blood vessel squeeze. It derives from the way these compounds bind to receptors in the sympathetic nervous system, altering signals to the vascular system, triggering the change.
It's this action on the nervous system which puts tetrahydrozoline in the "neurotoxic" category on the Material Safety Data Sheet required of all manufactured chemical compounds.
And this neurotoxicity tells us why eyedrops are indeed fraught with hazard if you swallow them -- or if you sneakily induce others to swallow them. Used as directed, they may indeed give you that clear-eyed look but that's mostly due to the constriction of blood vessels in the eye. Internally they also induce vasoconstriction as Toxnet calls it.
The resulting symptoms are nothing, nothing at all like the Hollywood version of events. They include rapid heart beat, nausea, blurred vision, drowsiness, convulsions.
The Toxnet entry, based partly on cases of children who swallowed a bottle of eyedrops or nosedrops left carelessly on a table or counter, notes that "drowsiness and mild coma" often alternate with periods of thrashing and hyperactivity. What does this tell us, aside from the obvious home precautionary warnings don't leave your eye drop bottles lying around the house and, by the way don't drink them? The record tells us that tetrahydrozoline while poisonous is not a top-of-line-lethal substance.
LD50 stands for lethal dose 50 percent, meaning the amount of a toxic substance that will kill half of a test population. And that difference means that while people do end up the hospital, they tend to survive the stay.
This is good news for victims and also for perpetrators, as so many of them end up arrested thanks in part to the very characteristic symptoms of eye drop poisoning. Eye Drops. Gotas para los ojos rojos: venenosas para beber, seguras si se usan correctamente. By Jennifer Churchill and Ari Soglin. Edited By Vered Hazanchuk. What is in redness-relieving eye drops? Children are most at risk of Visine poisoning Most cases of poisoning are not criminal, but accidental by children or pets who find the small bottles of odorless, clear solution.
Previous Redness-Relieving Eye Drops. Improved Dry Eye Drugs for and Beyond. What drops should I use before surgery? In what order should I use eye drops? Why is near vision blurry after dilation?
Find an Ophthalmologist. Call poison control and get emergency care as soon as possible. In general, be careful about using such eye drops, even if they go where they are supposed to go. While they are approved by the U. Food and Drug Administration FDA for over-the-counter use, avoid using such medications unless you really need them.
All medications can have side effects. Stop using such eye drops and call your doctor if you experience any other eye symptoms such as pain, changes in vision, pupil dilation, or excessively watery eyes when you are not watching the movie The Notebook.
Watch out for any symptoms that occur beyond your eyes including a headache, dizziness, anxiety, chest pain, shortness of breath, or irregular heartbeats. Sure, some causes of red eyes may be relatively benign. It could be from seasonal allergies, being tired, or smoking marijuana, for example. However, make sure that the redness is not from something more serious like a bad allergic reaction, an infection, glaucoma, or a harpoon.
If the cause is not obvious or not minor, see your doctor as soon as possible, especially if there are accompanying symptoms such as loss of vision or the presence of a harpoon. There are certainly other better ways of giving someone explosive diarrhea, not that you should ever try to give someone such misery.
This would not be a good prank. With such severe and potentially deadly risks, it is just not worth the squeeze. Using tetrahydrozoline active ingredient in Visine on the surface of the eye has been demonstrated to be safe for self-use for more than 50 years.
Visine is clearly labeled for external use only and should never be swallowed. This is a BETA experience.
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