This is an extensive review of what antibiotics do to the microflora of the GI tract. Many MDs overuse antibiotics "just to be sure" that a bacteria may be causing symptoms; this is very dangerous thinking. It is common knowledge that antibiotics are massively overused in treating colds, flus, ear infections, etc. Yeast syndromes, leaky gut syndrome, and other side effects from antibiotics can lead to major disabilities that can last for months to years.