Hi Back, As you will hear from others, trying to cut back to moderate drinking is a non-starter. It won't work. If you think you need to moderate, then you fall into the category of a person w/ significant alcohol problems (dare I say alcoholism?) I suggest that you attend AA for a while, for there you'll learn for certain whether or not you're an alcoholic.
As to the prescription meds, talk to your doctor. And please let him know you have a drinking problem. He's the best one to advise you on this matter.