iO 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: Active Constituent: 100 g/L FENBENDAZOLE Dose Rates & Administration Instructions: CATTLE: 7.5 mg/kg Fenbendazole or 3 mL per 40 kg bodyweight. Cattle in excess of 680 kg to be dosed at 3 mL per 40 kg bodyweight. HORSES: 10 mg/kg Fenbendazole or 5 mL per 50 kg body weight. For the control of Strongyloides westeri in foals: 50 mg/kg or 5 mL/10 kg body weight. Independents Own Fenbender 100 Oral Drench may be administered to horses by nasal tube, drenching gun or dosage syringe. Recycle containers via drumMUSTER.