I had a really bad infection this summer. At one point they had me on three different drip antibiotics, two of which were Cipro and Flagyl. You know it is nasty stuff when it burns as it comes through your IV line. Best wishes. At the hospital they told me it is common practice now to simultaneously take a probiotic and to continue with it for several weeks after you finish the antibiotics. If you aren't already doing this, it may be worth asking your doctor. For me, it helped a lot with the, uh, noisier side effects.