Well, obviously the first thing you can do is stop binge drinking.
No one's telling you to stop drinking altogether, but knowing when to stop can prevent a lot of potential problems before they ever start.
Another thing you can do is watch your friends for possible signs of alcohol poisoning. No, you're not a chaperone or a baby-sitter. But a real friend wouldn't just sit and watch as someone drinks to a point where they could harm themselves. Besides, nothing messes up a good time faster than someone getting sick in the middle of the fun.
Lastly, if you drink, don't drive . You'd be surprised at how many people still get behind the wheel after a few drinks - and it's still stupid. Don't put yourself and others at risk. Have designated driver or call a cab. Just leave your keys in your pocket.