Could alcohol be used as an antibiotic?
No.  The CDC recommends using a hand sanitizer at at least 60% ethanol.  Most preparations used in the lab are 70% ethanol.  Humans start to risk death somewhere around the 0.3% alcohol level (BAC), especially around 0.5%.  People have gone higher, but even 1% BAC would be completely useless against bacteria.  You'd be dead long before the bacteria died.  Besides, if you've got bacteria in your blood, you've got bigger problems than a simple infection.

In a pinch, though, it can be used as a topical antiseptic, as per this fun article.