Check the listing for details. Panacur Powerpac Equine Dewormer. Condition: New. Listed at 122.99 USD. Panacur Powerpac Equine Dewormer Panacur PowerPac is recommended for horses in the Spring and Fall as part of a regular deworming program and as treatment for horses with an active parasite infestation. The active ingredient, 10% Fendbendazole, is highly effective on larvae and adult parasites and especially encysted small strongyles (parasites imbedded in intestinal tissue). A PowerPac may be indicated if horse is exhibiting signs like weight loss, diarrhea, "hay belly", or abdominal distress. Check with your vet. The PowerPac contains 5 double-doses (57 grams in each paste syringe), for an effective 5 day treatment for horses up to 1500 pounds. Safe for all horses including stallions and pregnant mares and highly palatable with a tasty apple cinnamon flavor to make your job a little easier. Merck 5 double dose paste syringes