Personally I would not take antibiotics at all. Fair enough if you actually NEED them. But antibiotics do not distinguish between the good and bad bacteria, both are destroyed. If you are on antibiotics please take a probiotic, continuing after the prescribed antibiotic course is over. Your gut is pretty much the central business district of your body! You dont want to be messing with it. If your life depends on it take them, though try and look for natural alternatives. Remember... many of the products today are produced for their economic importance and capacity to be successfully marketed.