4% alcohol, so beer or weak cider?
I'm a bit confused as to why you are telling us what the alcohol percentage was rather than how much you drank. If you only drank a small amount, then passing out would be unusual and it could possibly be a sign that something is wrong, I guess? If you drank pints and pints, then yes, passing out is one of the things which happens when you get blind drunk. Since you didn't die at the time, you will be fine from that one occurrence. If you do it regularly, then yes, there are health implications.