Yogurt is a milk product, and is fine to eat. Taking probiotics while taking antibiotics will help prevent complete depletion of intestinal bacteria. My own experience this past year showed me how important it is to do so. I was on IV antibiotics, followed by a 10 day course of a combination of antibiotics. My prior experience was that I would have problems for many months after taking antibiotics. Taking the probiotics, including yogurt, greatly reduced the problems I had after taking the very strong antibiotics.