Unique mode of action is what makes PANACUR (fenbendazole) so effective against the most dangerous parasites of the horse. Proven Safe – Safe for foals, pregnant mares and older horses Works on a wide variety of parasites – Labeled for the control of large and small strongyles (including migrating larvae), pinworms and ascarids (roundworms) Effective on encysted small strongyles – A larvicidal dose is the only FDA-approved treatment for all stages of encysted small strongyles Reliable protection for foals – Widely recognized as the product of choice for treating ascarids in young horses Combat resistance – May be effective even in the face of prior fenbendazole resistance when used as part of a strategically designed anthelmintic program Unique Mode of Action – The antiparasitic action of PANACUR (fenbendazole) POWERPAC is due to the inhibition of energy metabolism in the parasite