Insufficient funds http://xtube.in.net xtube.com Optaflexx, sold by Lilly's Elanco Animal Health, and Zilmaxboth belong to a family of drugs called beta-agonists, a classof non-hormone growth promoters that have been deemed safe foranimals and humans by the U.S. Food and Drug Administration.Both products are fed to cattle prior to slaughter to increaseweight by as much as 30 pounds of lean meat.