Even though antibiotics are sometimes necessary, you are right about the fact that they kill both good and bad bacteria as they do their job in the body. However, you can certainly take probiotics while you are taking a course of antibiotics (in fact we recommend it), just be sure to take them at separate times during the day so that they don't counteract one another. For example, if your prescription says to take your antibiotic in the morning and at night, take your probiotic supplement at midday in order to obtain the maximum benefit. In addition to helping replace the good bacteria in your gut that are so important for healthy immune function, taking probiotics while taking antibiotics may also help reduce antibiotic-induced digestive issues such as diarrhea.