While she's on the antibiotic, S. boullardi is a great one. It is a beneficial yeast and so is not killed by the antibiotic. It will take up space in the gut as bacteria die and will help to keep pathenogenic bacteria from growing.
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In addition I would also use a multi-strain probiotic that includes bifidus strains but DOES NOT HAVE PREBIOTIC such as inulin, FOS, chickory etc. Prebiotics are a marketing tool for product differentiations...prebiotics actually just feed bad bacteria. Part of the reason for cost difference is the number of organisms per "serving" which is called CFU. The higher the count, the more good bacteria she's getting. You need a high count with antibiotics. Really want to push a lot of good bacteria in there but as far AWAY from the antibiotic dosing as you can.
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The very best, most effective probiotics are fermented foods. Saurkraut (or just saurkraut juice), 24 hr fermented yogurt (I make mine in my oven with just the heat of a light bulb.... look on pecanbread.com if you're interested this is great for general health on an ongoing basis), kombucha, kefir, etc. Food based probiotics are able to travel further down the GI tract in greater numbers. It really does make a difference.
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Continue with probiotics even after stopping antibiotics. Another thing that will help is to reduce sugary, refined carby foods that feed pathenogenic organisms.
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I cured my daughter from a clostridia infection with just probiotics, GAPS diet, and no antibiotics. Even today she had nausea, sweaty but with clammy forehead, difficult urination, no energy, and I gave her a huge dose of probiotics and VOILA, happy and running around in a few hours.