I would modify this recommendation to say that the shot version (Vivitrol in the US) is not necessarily compatible with The Sinclair Method which requires you to take Naltrexone only when you are drinking. So unless you drink every day, it might not be the best fit. I myself was a binge drinker, on any given day I drank either 0 drinks or 10+, so the Naltrexone pills were the best fit for me.