Do not add water. Special Fiber Formula for Diarrhea. For the dietary management of diarrhea in infants and toddlers. Milk-free; Lactose-free; Iron-fortified. Breast milk is best for babies except where special medical conditions exist. Isomil DF (Diarrhea Formulation) may be specified by your doctor when your infant older than 6 months or toddler has diarrhea. Isomil DF is a nutritionally complete, milk-free special fiber formula designed to shorten the duration of diarrhea. Feed Pedialyte Oral Electrolyte Maintenance Solution for hydration during the first 24 to 48 hours of diarrhea and begin feeding Isomil DF at the direction of your doctor. Isomil DF should be used for 7 to 10 days or as directed by your doctor. Your doctor may recommend Isomil Soy Formula with Iron for milk-free feeding after diarrhea has stopped. Isomil DF should not be fed to infants or toddlers with constipation.