Bene-Bac Plus Pet Gel contains live, naturally occuring microorganisms. It includes Prebiotic FOS as a source of carbohydrates. It is recommended anytime an animal experiences changing nutritional or environmental conditions such as when a new pet arrives home, when travelling, 1 to 2 hours after deworming, 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.