It'll give you incentive not to drink when you take it, I've been told its painful as all hell if you do drink on it, or at least try to drink on it.
The main problem with antabuse is: If you really want to drink, all you have to do is NOT take the antabuse and wait. Its success is mainly based on the idea that you take it regularly or whenever you're going to be around alcohol or tempted to drink. You can drink with no problem if you dont take it.
I guess it kinda goes with the saying that all addicts will hear, "you wont be able to change until you really want to change". If you don't really want to change and stop drinking, antabuse wont keep you from it. It might for a little while, when you do take it, but all you have to do is not take it and you're clear to drink.
It'd work best if you take it, for example, before going out to see friends at a place that will have drinking or a strong temptation to drink, like a ball game at a buddy's house or restaurant that serves booze, or a family dinner where people are drinking, or whatever. Times when you don't want to drink, but you're worried about the situation tempting you to drink, and you're worried that the temptation will be too great and you'll cave. Take antabuse before it, and you'll have the ghost of violent sickness haunting each thought you have of taking a drink. And in the event you say "fuck it" and decide to take a drink, you'll be puking until you're dry heaving. The hangover without the intoxication. I guess its a shot at negative reinforcement, every time you drink you get violent pukes so eventually you wont want to drink.
But it'll only work well if you take it. You can beat it by ignoring the pill bottle in your cabinet.
Also, Antabuse isn't going to do anything about cravings or other psychological urges to drink and seek out drinking/excuses to drink. It also wont really do anything about physical aspects of drinking/alcoholism, but since you're a weekend binger I really dont think you'll have any withdrawal. It just makes drinking painful, but you'll still want to, and you'll still think about it.