S-Enantiomer of Omeprazole with which shares similar characteristics. Due to a high serum-protein-binding capacity, Omeprazole is excreted into breast milk in non-significant amount without side-effects among breastfed infants from treated mothers. Since it's neutralized by the acid pH of stomach, capsules with enteric coated granules are used. Because of this, it is thought that the small quantity of Omeprazole that may reach the breast milk would be neutralized by infant's stomach. In addition, absorption is greatly decreased by the presence of food. Esomeprazole has been used for treatment of newborn and premature infants. Hyperprolactinemia and galactorrhea have been reported by the use of Omeprazole.