How soon after breast augmentation is it safe to have alcoholic beverages?

Definitely after you have finished your narcotic pain pill regimen as pain pills and alcohol can be extremely dangerous and even deadly. Most physicians want you to refrain early on as your judgement can be impaired and you could slip and fall for instance and hurt yourself and the surgery site causing need for reoperation. Please check with your PS and get their recommendations

Always best to check with your own plastic surgeon about specific post operative instructions. In my practice, a reasonable amount of alcohol consumption would not be a problem 7-10 days post op, as long as you are off medications and you do not over do (cause injury). Best wishes.