PANACUR POWERPACPanacur Powerpac Horse Dewormer Panacur Powerpac is a highly effective 10% Fenbendazole paste, the only FDA approved treatment targeting all stages of encysted small strongyles in horses. Since small strongyles can make up to 90% of a horses worm burden, routine deworming with Powerpac is essential for maintaining optimal equine health. Recommended for use 1 2 times per year, this dewormer provides a comprehensive solution for parasite control.