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Equine Deworming Regiments

Deworming Regiments


Parasites are a leading cause of colic in the horse!  Strategic deworming is an important part of your horses preventive health program.  In the spring worms encysted (or hibernating) in the wall of the colon emerge due to favorable environmental conditions.  Killing these parasites prior to the emerging process will prevent a lot of damage to the intestine and thus helping prevent colic.  Incorporating a single dose of moxidectin (Quest), in the early spring, into your rotation will accomplish this goal.


Due to the concern of drug resistance, coupled with the fact that no new anthelmentic’s are being developed, then recommended way to control intestinal parasites has evolved.  Parasitologists believe that 80% of intestinal parasites are shed by 20% of the horse population.  Rather than automatically deworming every two to three months, it is now recommended that the use of an anthelmentic be based on a fecal exam.  If the fecal is negative, there is no need to deworm.  In a given population of horses, after a series of fecal exams, it usually becomes apparent which horses are the shedders.


Deworming Programs


1)      Deworm based on routine fecal analysis

  1. Identify worm burden, deworm accordingly
  2. Deworm every 6 months regardless as a purge treatment and to control bots

2)      Paste/liquid dewormer once every 60 days, rotating anthelcides.


  • January – Strongid (Pyrantel Pamoate) Safe for ages 3 months and OLDER
  • March – Ivermectin
  • May – Moxidectin (Quest) Safe for ages 6 months and OLDER
  • July – Ivermectin
  • September – Oxibendazole (Anthelcide)
  • November – Ivermectin with Fenbendazole (Equimax)


3)      Daily dewormer with Strongid C or Strongid C2x along with Ivermiectin twice yearly for control of bots.





John F Bitter DVm

Argyle Veterinary Hospital

Thank you guys so much for coming out on such short notice when I was panicked about one of my horses. He turned out to be ok, but I may have had a melt... Read More

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