iO Fenbender – Oral Broad-Spectrum Worm Drench iO Fenbender is a ready-to-use, broad-spectrum oral drench for the treatment and control of benzimidazole-sensitive mature and immature roundworms, as well as lungworm in cattle. It also provides effective control of large strongyles, small strongyles, ascarids, and pinworms in horses. Active Constituent: 100 g/L Fenbendazole Dosage & Administration CATTLE 7.5 mg/kg Fenbendazole (equivalent to 3 mL per 40 kg bodyweight). For cattle over 680 kg, dose at 3 mL per 40 kg bodyweight. HORSES 10 mg/kg Fenbendazole (equivalent to 5 mL per 50 kg bodyweight). For treatment of Strongyloides westeri in foals: 50 mg/kg (equivalent to 5 mL per 10 kg bodyweight). Administration options: nasal tube, drenching gun, or dosage syringe. Cattle Dosing Guide Bodyweight (kg) Dose (mL) No. of Animals per 1L Pack Up to 80 6 167 81 – 120 9 133 121 – 160 12 83 161 – 200 15 67 201 – 240 18 55 241 – 280 21 47 281 – 320 24 41 321 – 360 27 37 361 – 400 30 33 401 – 440 33 30 441 – 480 36 27 481 – 520 39 25 521 – 560 42 23 561 – 600 45 22