Bene-Bac Pet Gel contains live, naturally occurring microorganisms. It includes Prebiotic FOS as a source of carbohydrates. It is recommended any time an animal experiences changing nutritional or environmental conditions. Give the indicated amount when a new pet arrives home. It can also be used when traveling, 1 to 2 hours after worming, at birth, prior to supplementing the newborns diet with milk replacer, at weaning, when dietary changes occur or as indicated by your veterinarian when pets are treated with antibiotics.