To Kellie R. Omnipaque 300 is a iodinated radiocontrast agent generally given IV but can be administered orally. It is almost exclusively excreted unmetabolized in the bile and urine with a very rapid clearance and short half-life (less than a few hours). Because the iodine is covalently bound, almost no free iodine occurs via metabolism of this product(good!!). The oral absorption in adults and children is extremely small ( < 0.1 - 0.5 %). The package insert contains oral dosing recommendations for children "less than 3 months". So even if it is excreted into milk, the infant would likely not absorb any. Even the package insert says that women can begin breastfeeding after 24 hrs. So this product appears to be quite safe for bfing moms. I assume your inquiry on "Oral Scan C Barium Swallow " means just an oral barium preparation. Barium when taken orally is completely unabsorbed, and simply passes out in the feces. Oral barium is unlikely to produce any problem in a BFing mom. *********************************** T.W. Hale, Ph.D. Associate Professor of Pediatrics Texas Tech University School of Medicine ***********************************