What Cannonguy said, BUT do not take them within a 2 hour span of each other i.e. Take the antibiotics at 4pm don't take a probiotic smtikk at least 6pm. The antibiotic will kill the good bacteria in the probiotic. Also the pharmacist told my hubby when I had sinus surgery that a lot of the time antibiotics will make your stomach sick if not taken with enough water to break it down and move out of your stomach faster. Ever since learning that I drink a FULL glass of water with antibiotics and make sure to eat even a little something with it!