This is really an individual thing and where blood work comes into play. Some guys can't run drol or dbol without killing their livers while others can slam both with beers and never have an issue. Understand your values and what your putting into your body and make the call for yourself. If you are getting bloodwork a few times a year and drinking while on and everything looks fine then have at it. But booze will **** with your gains if you over do it.