It's absolutely bad to drink eye drops!!! Get eye drops in your stomach has a variety of harmful side effects for you, such as diarrhea,dramatically lowering body temperature, causing severe breathing difficulty, respiratory failure, blurred vision, nausea, vomiting, blood pressure fluctuation, tremors, seizures and even coma.
Fortunately, most eye drops are just mild saline solution, so if you didn't drink too much, that will be no big problem. So, please do not drink eye drops and do not mix your eye drops in some drink, just in case you drink them.