It's interesting, i can see how it (not drinking due to medication) might work, but it seems to me like fear based recovery, i'm not sure it's the best motivation for stopping, but of course i can only speak for myself. If it works and the person is happy with it then i guess that's up to them...
I'm not sure it necessarily always works as a deterrent- i remember George Best being on something that was supposed to stop him drinking, as it would be really painful if he drank - but he carried on drinking.