I take a probiotic with 30 billion active cells and 8 probiotic strains in between doses of antibiotic. You need at least 2 hours before next dose of antibiotics for the probiotic to do its thing. It has been a game changer for me. And as xvee suggested stay away from sugar sources. This can be tough, it comes in all sorts of disguises. Fruit, juice, milk, pretty much anything white, so whole, fresh, home cooking is your best bet. If you can handle onions and garlic, incorporate those into your meals-natural probiotics. Like saurkraut? Also a good thing for yeast overgrowth.