The most common use of vasoconstrictors is in
over the counter - use
eye
drops, Usually the active ingredient is "
Tetrahydrazoline" (think "gets the
red out").
Using vasoconstrictives to solve eye irritation is probably a bad idea. Eyes
usually become red as a response, where the body is dilating the blood
vessels in order to increase blood flow to remove the irritation. As such, these
eye medications form a useful cosmetic palliative, but have little positive
effect on the underlying problem.