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Nexmectin Horse Wormer


Nexmectin is a horse wormer containing the active ingredient Ivermectin. It is an easily administered oral paste. One syringe will treat up to 700kg.

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All orders over £39 receive free delivery * *terms and conditions apply


Returns It should be noted that, unfortunately, we cannot accept returns of any labelled products, including prescription medicines and flea and worming products. If the customer has requested a cancellation but the order has already been dispatched then we will not be able to cancel and refund the order. This also applies if the customer has ordered the incorrect dosage. Returns of any labelled products are only acceptable if it is due to an error in processing, or for an official recall. We are also unable to accept the returns of Caninsulin syringes, even if the packaging is unopened.

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Nexmectin is used to treat:

  • Large strongyles
  • Small strongyles (not encysted larvae)
  • Ascarids
  • Pinworms
  • Neck threadworms
  • Bots

Nexmectin contains 18.7mg/g ivermectin. Dosage of nexmectin is 1 notch per 100kg body weight of horse up to 700kg.



The paste is given by oral route.  To ensure administration of a correct dose, body weight should be determined as accurately as possible. The animal’s mouth should be free from food to ensure swallowing. Turn the screw gauge on the syringe plunger to the body weight of the horse. The tip of the syringe barrel should be inserted at the interdental space (the gap between the front and back teeth) and the paste deposited on the base of the tongue. Advance the plunger as far as it will go, depositing the medication on the base of the tongue. Immediately elevate the horse’s head for a few seconds to ensure swallowing.

Worm resistance can be caused by too frequent administration of the same class of anthelmintic or under-dosing when administering. It is important to accurately determine your horses bodyweight. Ideally a targeted worming programme should be adhered to using worm egg counts and only worming the horses with high counts. Check out our blog on worm management here

Nexmectin is safe to use in pregnant and lactating mares.

For further information on this product please see the link below:

Ivermectin can be poisonous to dogs therefore always dispose of the oral syringe responsibly.