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Strongid by Pfizer/Zoetis

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Strongid® Paste

Generic Name:

Equine Pyrantel pamoate

General Parasite Control Description:

Implementing effective parasite control is an important part of your horse's preventative health program as they can infect horses at any age and adversely affect health and performance.  Parasite eggs and larvae are in your horse's environment and can remain viable for years despite harsh weather conditions. Internal parasites are commonly found in horses that appear healthy and infected animals continue to contribute to the spread of eggs in the environment.  Parasite infestation can cause a loss of condition, lethargy, loss of appetite, poor coat, weight loss, diarrhea, and colic.  While they undergo different stages of maturation, parasites can vary in anatomic location from the intestinal tract to other tissues in the horse.  Each antiparasitic drug will vary in its effectiveness in targeting different stages of the parasite's life cycle.

What is this drug?
  • This is a broad spectrum oral anti-parasitic drug containing pyrantel pamoate.  Pyrantel pamoate interferes with neurotransmission causing paralysis and an inability to attach to the intestines.
Reasons for prescribing:
  • Pyrantel pamoate is effective in the treatment and control of the following parasite infections in healthy horses:
    • Strongyles - redworms
      • Eggs are passed by infected horses onto the grass which develop into infective larvae.  The horse eats the larvae from the contaminated grass and they undergo several stages of maturation within the intestines and can cause irritation, damage, and colic in certain circumstances
      • Specifically targets large strongyles:
        • Strongylus vulgaris (adult stage)
        • Strongylus edentatus (adult stage)
        • Strongylus equinus (adult stage)
      • Specifically targets small strongyles (adult stage)
    • Ascarids - roundworms
      • Eggs are passed by infected horses onto the grass which develop into infective larvae.  The horse eats the larvae from the contaminated grass and they undergo several stages of maturation within the intestines and can cause irritation, damage, and colic in certain circumstances.
      • Specifically targets:
        • Parascaris equorum (adult stage)
    • Pinworms
      • Larvae mature in the large intestines and adult worms migrate and live in the colon.  The female deposits eggs around the anus which causes skin irritation.  Horses commonly have a roughened tail head from rubbing against objects.
      • Specifically targets:
        • Oxyuris equi (adult stage)
What horses should not take this medication?
  • Consult the product insert regarding specific age recommendations for younger horses
  • Horses that are sick, debilitated, or underweight
  • Horses with a known hypersensitivity or allergy to this drug

You need to accurately determine the weight of the horse with a scale or a weight tape prior to administration of this drug as the dose is based on the weight of the horse.  Inadequate dosing will be ineffective and can encourage drug resistance.  If you are unsure how your horse will react to oral administration of a medication, request assistance or demonstration by your veterinarian.

Administration using an oral dosing syringe:
  • Accurately determine the weight of the horse
  • Dial the correct dose on the product syringe
  • Ensure there is no feed in the mouth
  • Remove cap from product syringe
  • Place the tip of the syringe in the side of the horse's mouth in the space between the teeth
  • Gently push the plunger and deposit the medication on the back of the tongue
  • Remove the product syringe from the mouth
  • Raise the head slightly and ensure that the medication is swallowed
  • If product syringe is empty
    • Dispose of the product syringe and contents in an appropriate container
  • Partially used product syringes
    • Store properly with the cap secured tightly
  • Wash hands after use
Administration of an oral suspension:
  • Accurately determine the weight of the horse
  • Shake the liquid suspension to ensure contents are mixed thoroughly before each use
  • Measure the appropriate amount of medication
    • The medication can be mixed in the normal grain ration
    • The medication can be drawn up in a dosing syringe and given as per above directions
    • The medication can be given with a stomach tube after mixing with a sufficient quantity of water
What is an effective parasite control program? 

Parasite resistance is a current threat to effective parasite management.  Talk to your veterinarian about developing a selective and responsible deworming strategy for your horses.

What to tell/ask your veterinarian before giving this medication?
Talk to your veterinarian about:
  • The benefits of doing a fecal egg count
  • Number of animals on your premises
  • Parasite prevalence in your geographic location
  • Health status of the horses on your property
  • Movement of animals on and off your property
  • Plans for breeding and if your horse is pregnant
  • If your horse has experienced any other medical problems or allergies
Storage and Warnings:

This product should be stored at room temperature and protected from freezing.
Keep this and all medication out of reach of children and pets.
Call your physician immediately if you accidentally take this product or in case of contact with eyes.

Potential side effects:
  • Adverse reactions are uncommon at recommended doses
Can this drug be given with other drugs?
  • This medication should not be given with other antiparasitic drugs such as: diethylcarbamazine, levamisole, morantel, organophosphates, or piperazine
  • Do not give new medications without first talking to your veterinarian
  • If your horse experiences any unusual reactions when taking multiple medications, contact your veterinarian

Contact your veterinarian immediately if you have accidentally given more than the prescribed amount.

What else should I know?

Notify your veterinarian if your animal experiences any adverse reactions to this medication.

This product should not be used in horses or ponies intended for human consumption.

Check with the appropriate regulatory body regarding the use in competition horses.

As with all prescribed medication, Equine Pyrantel pamoate should only be given to the horse for which it was prescribed and any medication given should be properly documented for that individual.

This is just a summary of information about Equine Pyrantel pamoate.  If you have any questions or concerns about this product or the parasites it prevents, please contact your veterinarian.

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