Using the wrong eye drops that are not manufactured using the right processes for too long or too often can often have side effects. While the chances of most over-the-counter medication aren’t severe, it helps to keep in touch with your doctor no matter what you are using. Paying attention to some common symptoms when you start using new eye drops is also one way to go ahead. Sometimes, drops are also known to cause “rebound swelling and redness”, which happens after the condition completely goes away. Touching base with a good doctor is one way to avoid this. However, if it happens too much, the doctor might suggest surgery or some other form of sabotaging the condition for good.