 NASDAQ:PAHC Today, the Food and Drug Administration FDA provided notice of Federal Register publication of its intention to take a number of actions related to its ongoing review of the regulatory status of Mecadox carbadox. Mecadox has been approved and sold in the United States for more than 45 years and is a widely used treatment for controlling bacterial diseases in swine, including Salmonella and swine dysentery, resulting in improved health and welfare for newly born and young pigs. 