Fenbender 100iO Fenbender 100 Oral Drench for Cattle & Horses Independents Own Fenbender is a ready to use broad spectrum oral worm drench for control of benzimidazole sensitive mature and immature roundworms and lungworm in cattle, and for the control of large strongyles, small strongyles, ascarids and pinworms in horses. Active Constituent: 100 g L FENBENDAZOLE Comparable to COOPERS PANACUR(R) 100. Horses: For treatment and control of mature and immature