Equine Deworming Guide

Use this guide to help create an internal parasite control program for your adult horse from The Horse.

Horse owners should perform targeted deworming to prevent parasitic disease in their horses, minimize parasite egg shedding on their properties, and help prevent anthelmintic resistance. 

Terms to Know

  • Anthelmintic: A deworming drug. The main classes of anthelmintics used in horses are benzimidazoles (e.g., fenbendazole), pyrimidines (e.g., pyrantels), and macrocyclic lactones (e.g., ivermectin, moxidectin).
  • Anthelmintic resistance: An inherited trait in which parasites survive dewormer treatment and pass their resistance on to subsequent generations of worms.
  • Fecal egg count (FEC): The number of parasite eggs per gram (epg) in a horse’s manuresample before deworming.
  • Fecal egg count reduction test (FECRT): The percent reduction in parasite eggs based on an FEC performed 10-14 days post-deworming.
  • Refugia: The unreached population of worms during treatment (e.g., those parasites stages on pasture or in untreated horses). The more parasites in refugia, the less chance of them developing resistance. Ideally, we want to deworm when refugia levels are at their highest, in spring and fall.

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How To Administer Equimax

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For more information, please view the EQUIMAX® product information sheet.

Consult your Veterinarian to determine the best deworming program for your horse.

FOR ORAL USE IN HORSES 4 WEEKS OF AGE AND OLDER. EQUIMAX® (ivermectin/praziquantel) Paste should not be used in other animal species as severe adverse reactions, including fatalities in dogs, may result. Do not use in horses intended for human consumption. Swelling and itching reactions after treatment with ivermectin paste have occurred in horses carrying heavy infections of neck threadworm (Onchocerca sp. microfilariae), most likely due to microfilariae dying in large numbers. Not for use in humans. Ivermectin and ivermectin residues may adversely affect aquatic organisms, therefore dispose of product appropriately to avoid environmental contamination. Trademarks belong to their respective owners.