While on antibiotics, a person should take a “probiotic”. The antibiotic kills all the good bacteria in your gut, and you get diarrhea, cramps, bloating. Acidophilus (or other probiotics) will help replace the good bacteria. This is also a very effective treatment for diarrhea caused by the “stomach flu”. Acidophilus is present in yogurt, but most containers don’t tell you how much. I prefer to take acidophilus capsules. For the kids, you can get liquid, powder or chewable versions. Most good health food stores will carry this.