It works by constricting blood vessels, which reduces blood flow to your eyes so they look less red. Andrew Holzman More Quotes by Andrew Holzman More Quotes From Andrew Holzman If you use the drops on a regular basis, your body will adapt to the drops, then when you stop, you end up getting a rebound effect where your blood vessels dilate and your eyes start to look red. Andrew Holzman latest-headlines It should go away on its own in about a week. Andrew Holzman latest-headlines We don’t blink as much when we look at screens, which causes dryness. Andrew Holzman latest-headlines Alcohol causes your blood vessels to relax. Andrew Holzman latest-headlines