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Deworming Dos and Don'ts Chart

Deworming Dos and Don'ts


The biggest mistake made deworming a horse is using only ivermectin wormers. If you only use one type of chemical class your horse can become tolerant, and your worming schedule will be ineffective. Below is a great chart used to describe the different Drug classes for wormers and why they are used.

Month Active Ingredient Product Names Parasites Affected
Jan-Feb Pyrantel Strongid Paste, Pyrantel Exodus Small Strongyles, Large Strongyles, Pinworms, Roundworms, Bots, Ascarids, Hairworms, Threadworms, Tapeworms
Mar-Apr Benzimidazole Safe-Guard, Anthelcide EQ, Panacur Small Strongyles, Large Strongyles, Pinworms, Threadworms, Roundworms
May-Jun Ivermectin DuramaMectin, Durvet Ivermectin, Zimectrin Gold, Equimax, Quest Gel Bots, Large/Small Strongyles, Bloodworms, Ascarids, Threadworms, Pinworms, Hairworms, Lungworms, Large Mouth Stomach Worms
Jul-Aug Pyrantel Strongid Paste, Pyrantel Exodus Small Strongyles, Large Strongyles, Pinworms, Roundworms, Bots, Ascarids, Hairworms, Threadworms, Tapeworms
Sep-Oct Benzimidazole Safe-Guard, Anthelcide EQ, Panacur Small Strongyles, Large Strongyles, Pinworms, Threadworms, Roundworms
Nov-Dec Ivermectin DuramaMectin, Durvet Ivermectin, Zimectrin Gold, Equimax, Quest Gel Bots, Large/Small Strongyles, Bloodworms, Ascarids, Threadworms, Pinworms, Hairworms, Lungworms, Large Mouth Stomach Worms


This chart was made by HorseSaddleShop for informative purposes only. You always want to consult your Veterinarian before treating your horse. In some cases, your Vet will come up with a rotational worming schedule directed especially for your born, as they will know the risks for parasites in your area.

Some prevention to parasites can be made by cleaning manure out of pasture frequently, as well as feeding your horses from a feeder rather than the ground.

Here are some factors that can result in a higher risk of parasites for your horse:

  • Horses being pastured in a dry lot (dirt lot)
  • Sharing pastures with cattle, goats or sheep
  • Hight Pasture Population ( Having one or more horses per acre of land)
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