The decision on what is suitable to take might depend on whether there are addictions other than alcohol. For my self as an alcoholic only, I would have no problem in taking medication for pain relief. In fact I have found that such medications, which I have only had to take on one or two occasions in over thirty years, work very well with just minimal use. I seem to be more responsive so I can get away with less, or milder pain killers than when I was drinking.
The one drug I would avoid is morphine. Not from an addiction point of view but because it has that knock out effect which I absolutely detest about that kind of drug. I hate the way it has taken people out of the world before they are ready to go.