Would medication make birth control ineffective?

Well, if you consider beer, tranquilizers, depressants or marijuana to be medication, it is possible repeated doses over days could mess up one's pill taking schedule, and, uh-heh heh heh!

Seriously, my wife takes em' (b.c pills, that is), and she tells me that certain antibiotics could make it possible to conceive. The only other thing she's aware of is IF a woman stops taking the pill, she would DEFINITELY be more fertile than in normal circumstances (say for someone who's never taken it)! I am not aware HOW long that high incidence rate occurs in days or hours, but I would warn you it might not be very long...after all, that is why there is something called the day after pill...e.g when a couple goes on vacation and has sex ONE NIGHT w.o the pills left at home...uh-oh!!

JH-Natick, MA. USA