generally speaking, you'll be just fine as long as you don't overdo it. just play it by ear. the apap/alcohol generally won't damage your liver unless this is a common practice over time.
but i agree with baybex...the alcohol will just diminish your opiate high. what i like to do is experience the opiate high until it's worn off and i get tired and groggy. then i might have a couple of glasses of wine and pop a benadryl just before bed. works like a charm.
before you do any of this...KNOW YOUR TOLERANCE. i can't stress it enough. if not, you'll wake up with tubes up your nose, puking charcoal.