p.s. where did this myth that you cannot drink alcohol whilst taking antibiotics come from? There are very few where this is the case.
I don't think anyone is saying it applies to all antibiotics, just some of them. Some do interact badly. I once cut my thumb down to the bone and was given a very high dose of some antibiotic or other (can't remember what now). I ignored the warning not to drink under any circumstances, went out for a few pints and ended up convincing myself that an unidentifiable life force wanted to use me as a host entity. I've rarely been so scared in all my life.