Prescription-Only Anthelmintic Drugs: The Time Is Now.

In this article the author discusses prescription-only anthelmintic drugs for controlling parasites of U.S. livestock. He argues that their use has gotten out of control in the livestock industry, resulting in multiple-drug resistance in the majority of the most important parasite species of livestock. Topics include the control of nematode parasites, livestock health and productivity, and diagnostic surveillance of parasite infection levels on U.S. farms.