“…First, the growth of the mammary glands during lactation provides a new compartment of drug distribution, excretion (Clewell and Gearhart, 2002), and possibly metabolism as alcohol dehydrogenase (ADH) is expressed in breast tissue (Saleem et al, 1984;Triano et al, 2003). Second, the high nutritional demands associated with milk production coincide with remarkable changes in the gastrointestinal tract (Hammond, 1997;Hunt and Murray, 1958;Uvnas-Moberg et al, 1987). In rodents, lactation is associated with dramatic intestinal growth (e.g., increased height of the villi) and a generalized hypertrophy and hyperplasia of the mucosal epithelium (Hammond, 1997).…”