H2-type histamine receptor antagonist with similar action than cimetidine. It is excreted in breast milk in clinically non-significant amount, much less than the dose administered to newborns and infants with gastroesophageal reflux disorders. Although it does not normally affect prolactin secretion, there have been several cases of galactorrhea. Still unknown whether it is due to Famotidine itself or to gastroesophageal reflux. Famotidine, Nizatidine and Roxatidine are excreted into milk but in less proportion than Cimetidine or Ranitidine, which have been proposed as alternative to during lactation.