Metro will have been to protect your stomach, etc, from the Cipro, which would have been what you were given via IV. I know the feeling, after 9 days inside the disease house last year, except they didn't waste the time with the "good" bacteria as it would have been killed off by, in my case, Augmentin, they fed me something similar, can't remember the name, for that reason as heavy doses of antibiotics can be as bad on the stomach as NSAID drugs such as brufen.