Jeffers® Ivermectin, 1-dose

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Jeffers® Ivermectin (Anthelmintic and boticide) - Now in a gel formula! Treats horses up to 1250 lb body weight. Read More

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What You Should Know About Horse Worms: Treatments, Causes & Info

Common types of worms and a description of each plus what to use to deworm when (printable rotation chart in link at bottom.)


Jeffers® Ivermectin Horse Dewormer

Anthelmintic and boticide.

Now in a new gel formula!

Jeffers® Ivermectin Horse Dewormer is used to aid in the control of:

  • large and small strongyles
  • pinworms
  • hairworms
  • threadworms
  • stomach worms
  • lungworms
  • roundworms
Controls 46 species & stages of worms & bots.

Treats up to 1250 lb body weight.

May be used in horses of all ages, including mares at any stage of pregnancy. Stallions may be treated without adversely affecting their fertility.

View manufacturer and/or label information


  • Brand: Jeffers
  • Form: Paste
  • Active Ingredient: Ivermectin

Reviews (28)

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  1. 5.0 out of 5 stars

    "Works for Mine"

    I have three horses that have used this product in original form and now the gel. I just mixed a little less than 1/2 cup of plain applesauce with it stir it good and mix it with small amount of their grain and they eat all of it ; will continue using it

  2. 5.0 out of 5 stars


    The new gel is horrible they spit it out. What a mess. such a shame they have to mess with a proven good thing.

  3. 5.0 out of 5 stars

    "Gel wormer is not good"

    I have bought Jeffers ivermectin for years. The new gel is not good. I have multiple horses who can spit it out. Horses who have never offered to spit out wormer spit this out. So having to buy 2 wormers to get one horse wormed is not a good plan. Now I can't tell if they are getting the wormer swallowed or not. This is not a step forward.

  4. 4.0 out of 5 stars

    "Syringe too long for someone with small hands+"

    My horses and I like the new gel. The syringe seems longer than the old one. I have small hands and it is difficult to use for 2 of my 9 horses who hate to be wormed.

  5. 1.0 out of 5 stars

    "new gel formula is a step backwards"

    The only complaint I have is new gel doesn't stick. I did two horses and both spit it out. It was a waste of time and money. I will not purchase this product, in the gel form again.

  6. 5.0 out of 5 stars


    I have many horses, big, and the miniatures, plus have foals now and then, have used this wormer for years with good results. What I do is have the grain in the can add the wormer and mix it good-then pour into the feed bucket and they eat it all gone.As I had some horses that did not like it in the mouth,so I do it this way and no problem--had horses over 45 years. good luck

  7. 5.0 out of 5 stars

    "Babies with worms. "

    If anyone complained that it did not get worms in a baby, then you need to do your research. For babies, you do not depend on Ivermectin of ANY type, you need a Pyrantel Pamoate, or one of the other types to get roundworms. Roundworms after a horse turns a certain age do not live well in a horse (of course if they are encysted that is another story) but thrive in babies. Roundworms do not kill well with ANY ivermectin so I do my babies with Exodus, or a pyrantel pamoate product and do a full tube for a weanling and no problem. Then in the fall after the first killing frost I use Ivermectin. But a baby can die from roundworms if you depend on Ivermectin! Different wormers are better for different things. IE not all wormers get Tape worm.... treat with the correct wormer.

  8. 5.0 out of 5 stars

    "Always Good!"

    Always good! Saves us $$! Works great! And always the BEST service and SUPER fast shipping. We LOVE Jeffers!

  9. 5.0 out of 5 stars

    "happy customer"

    I have used Jeffers brand Ivermectin for more than 20 years with NO complaint. The medication is the same - read the label or ask you Vet. I like the smaller tube, easier to carry in my pocket.

  10. 5.0 out of 5 stars

    "Works just fine"

    I asked my husband about the plunger, as he used 2 of these yesterday on our TWHs. He said they initially do work hard, but once you get them going they work just fine.

  11. 1.0 out of 5 stars

    "horrible design "

    I am not disputing the effectiveness of the medication but the design of the plunger itself is terrible. None of my horses like taking their wormer. It's an argument at best and a down right brawl at times. When I finally did get the tip in their mouths, it didn't want to squirt the wormer out quickly and it took me several times before they got the proper dose. I've used other brands with none of these issues. I'd rather pay more for a product that doesn't irritate me and my horses so much.

  12. 5.0 out of 5 stars

    "Info source"

    "I question those reviews that state this is a weak form of Ivermectin. It has the same amt of active ingredient as the ""big name"" compounds. Also the last time I checked with my Vet there is no resistance buildup to this product. Perhaps Jefferswould have something to say in this regard. A foal showing the high infestation as described by one user would scare me silly. Best check your husbandry."

  13. 5.0 out of 5 stars

    "Ivermectin 1.87%"

    Ivermectin is not a weak wormer for horses when using properly. All wormers kill the worm but not the eggs. If you would follow up with Exodus (same as Strongid, cheaper)on the 18th day after worming with ivermec you will see a hugh difference in your horse. Day 18, all eggs hatched, none in system. day 19 you again have eggs. I rescue horses and start with safeguard when I first get animal, as worms are always positive, but I fear for the amt of so this will keep them from colicing on the amount of kill. 1 week later I do the Ivomec, 18 days the Exodus. 30-days later i do a cheap wormer. i am then good til the weather changes and start all over again

  14. 3.0 out of 5 stars

    "Good only in rotation"

    I use this wormer alot because it's cheap and I don't have a huge worm problem with my horses. The brand is fine, but the active ingredient is very weak. In my experience it is only good for maintaining a horse with few/no worms. It is much less effective on horses with major worm infestations because ivermectin is so over used, that many worms develop immunity. Again though, it's great to use in rotation with more effective wormers just to keep a non-wormy horse healthy.

  15. 5.0 out of 5 stars

    "Does a great job!"

    I was concerned that this product was not as effective as the brand name wormers but I just wormed a 3 month old foal with this wormer a few days ago. I didn't think the foal would be that worming but OMG the amount of dead worms that came out were staggering!! Very effective product and I will be following up with another worming in 4 weeks to clean this foal out again! Great product at a great price!

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