from a friend: They have a shot version too. The pill will work if you don't cheat. But taking the shot takes out all the guessing. I would do this your first few months.
Otherwise, the pill is better. Take it if you plan to drink, and dont take it otherwise.
As another poster has said, its easy to "overshoot". For me, after three pills I stopped craving for alcohol and only drink on social ocassions.