I've taken baclofen as has my wife. She found it started to give a good result at about 80 mg per day. Initially she was drinking about a litre of vodka a day starting at 7 am but when the baclofen kicked in she was able to stop completely. We got into problems with it when I suggested she go up to 270mg a day in three divided doses as per Ameisen's regime and that caused her serious side effects. I can't remember what they were but it made her not want to take it at all, which led to a catastrophic relaps, hosptial etc etc. A total meltdown.
Just go easy with it. After several years she added Acamprosate/Campral and that has had an even more marked effect because she has no relapses and doesn't have any other psychological issues at all.
The main side effect we both noticed was somnolence. At night my breathing would slow to the point that I felt I would stop breating. It's a muscle relaxant after all. It's scary but eventualy you do breathe. It also affected my thinking in that I would pause in conversation a lot which I think made people think I had been drinking. I appeared drugged or drunk, which is not great if you are working with the public. lol
We are ten years on now and it is a game changer. You have to embrace it and take the good with the bad and keep fighting. It's not a drug to be sneezed at. I've come to respect it because its as though you are fighting with it to get what you want and it fights you back. At the time it was scary but now I can take a couple of pills when I get a bit stressed and it has no side effects at all. My wife has gone down to 20 mg at night and in the morning. I don't think she would relapse if she didn't take it but why tempt fate. We went to Burns night and we were the only people who were stone cold sober at the end.