Deworming Decisions: Readers Discuss What Impacts Theirs

More than 780 readers of responded to a poll asking, "What drives your deworming product selection decision?"


results of poll on purchasing dewormer

Results were as follows: 

  • Strategic rotation of chemical classes 54.02% (423)
  • My veterinarian's recommendation 19.41% (152)
  • Fecal exam results 9.07% (71)
  • Other 7.92% (62)
  • What I've always used 5.36% (42)
  • My stable manager's recommendation 3.70% (29)
  • What my neighbor/friend is using 0.51% (4)

Readers shared why they choose the product they use in the comments below.

Poll sponsored by Intervet/Schering-Plough Animal Health.

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  • New research shows lots of resistance forming and we have no new dewormers being developed.
  • reading latest research, etc
  • My vet likes daily wormer with Ivermectin or Quest in spring and fall
  • I use a dewormer of diatomaceous earth with probiotics and vitamins Works great, avoids super worms.
  • My barn rotates chemicals every two months.
  • I do fecals at least 4 times a year then worm according to the results.
  • A strategy is good only if it actually works. My vet recommends FECs to find out & it saves $$, too
  • Large number of horses on 20 acres necessitate de-worming every two months
  • Each spring I start with a fecal exam and go from there. After that - it's rotation...
  • Quest Plus and ivermectin
  • price
  • rotation and price
  • cost
  • just Zimectrin every 8 weeks
  • I try to keep educated on efficacy and scheduling of various compounds and use them accordingly
  • Food grade DE + fecal results
  • And price!
  • I believe in mixing up my wormers so resistance does not develope., every 30 days
  • Although it has come to my attention how many people don't know or use a rotation of wormers.
  • a lecture I attended emphasizng the current problem with deworming product immunity
  • After intense research, found great rotation schedule, checked with vet, she tried to steal for self
  • Rotating 2 types for best results
  • fortunately I have several large pastures and the horses rotate themselves parasite infestation low
  • read current literature and evaluate products accordingly
  • Rotate at 2-month intervals with Praziqauntel in Sep and Moxidectin in Dec & Feb.
  • I do my own research into the types of dewormers that I use
  • I use product & regimen recommended by mini horse breeders
  • With the economy the way it is, cost is a big factor
  • price determines a lot
  • the price of the product
  • research, fecal exam, vet rec, animal and pasture conditions,usually 4 times/year with rotation.
  • My vet has done much research on dewormers, so I trust his recommendations.
  • rotate through 3 classes, using a "powerpac", 2xpyrantel, and adding Praziquantel
  • price and time of year
  • Price I use ivermectin and mail order for 8 horses
  • Follow charges and recommendations
  • Rotation of classes, based on veterinarian recommendations. Modified as recommended.
  • and price
  • price
  • What the horse Journal recommends
  • Price also matters
  • Change it up. Use something different every worming.
  • I use a daily wormer and 4 times a year with paste
  • What's effective - ivermectin with occasional rotation to a class to get tapes
  • I always choose well-known brands, not whatever is cheapest
  • deworm on a full moon, you get a greater kill as the worms are hatching at this time
  • daily wormer with Ivermectin Gold every 6 months
  • I switched to pellets, easy for me to administer dosage
  • past experience & information from articles on the topic.
  • ingredients being equal, then would choose one easiest to administer.
  • price
  • Targeting the most likely worms de jour
  • I always rotate chemical classes to keep ahead of parasites at their different life stages.
  • we've always been taught to rotate wormers
  • Daily Strongid 2X and yearly Ivermectin
  • my vet gives good advice!
  • I use eraquell pellets for the older ones & equest for the others, dont change brands as these work
  • Daily wormer and 2x year vet administered paste
  • Worm in the spring and fall for tapes other 4 times regular ivamectrin
  • and they love the apple flavor...much easier to give
  • Ivermectin subbed out with pyrantel pamoate and praziquantel every fourth dose
  • I also use fecal egg counts
  • Price and the type of parasites the product will remove
  • I board my horse and the barn requires all to be on daily feed through w/twice yearly ivermectin.
  • cost
  • using what has proven to work for me in the past
  • My vet does all the worming, so my horse gets whatever her vet uses.
  • price
  • Tapewormer once yr/alt Ivermecterin /Strongid
  • program approved by my vet
  • The latest research and findings from the Equus Magazine
  • price
  • We talk to the vet and other horse people
  • Weather conditions, time of season, and predominate parasites
  • also what my holistic Vet recommendation,I do not use chemical dewormers
  • Price and Quantity needed.
  • I do fecal exams quarterly and deworm or not and with what accordingly.
  • my horse colicks with the weaker products go figure
  • my reading on the subject along with price
  • The Horse's great articles about wormers and fecal exams!
  • rotate class,and go with brand(company) I trust
  • research, vet recommendation and palatability
  • with the wormer resistant strains becoming more common targeting the exact parasite is paramount.
  • cost & efficacy
  • PRICE ! I know enough to do a strategic rotation. But I can buy from multiple sources.
  • Price!
  • What the Mill puts on sale...but we also rotate.
  • It's also a matter of what's worked well before, vet rec's.
  • Mostly ivomec, occasionally panacur
  • Next deworming session I plan on rotational by buying a year's supply of the prepackaged wormers
  • what's on sale
  • current research by the company
  • Equimax w/ Praziquantel every 60 days
  • I have 4 horses in an area not very large.
  • Rotation and not over worming
  • Our stable manager is exceptionally knowledgeable; has done a lot of research. She knows her stuff.
  • I also consider health and exposure of horses; environment, vet, AAEP,
  • Ivermectin seems to do the job....and is very reasonable in price...I own 25 horses and deworm 3-4 m
  • Proper use of wormers, 2x per year Daily wormer: weanlings thru yrlg yr.
  • Use a daily wormer, some indication it may help prevent reinfection of EPM
  • Chemical class and price
  • And time of year
  • Equimax in the Spring and Fall; Ivermectin inbetween.
  • Strategic rotation every 2 mos + Strongid 2x Daily
  • what worms are present at that particular time of year
  • We rotate, but shop for value as well.
  • Safety - I use an herbal rather than chemical wormer and then have FEC's done
  • It also depends on what time of the year it is. For instance I worm for tapes and bots in late winter
  • Combination of fecal results the worming products that have given good results.
  • Daily wormer to take advantage of colic surgery coverage
  • I have a draft so I am influenced by weight limits within a chemical class
  • Most of the time I try to find dewormers for larger classes of horses-need bigger sizes
  • Most of the time the price of the product.
  • utilize latest research on resistance plus FEC results
  • but mostly, what is on sale!
  • Also go by price
  • I follow rotation of the chemical classes according to directions from my veterinarian
  • rotational care with most economical product picked for purchase
  • Vet-Administered
  • price
  • cost and time of year.
  • I read everything i can about dewormers and decide which is the best and what is offered at the store

About the Author

Megan Arszman

Megan Arszman received a Bachelor of Science In print journalism and equine science from Murray State University in Murray, Ky., and loves combining her love of horses, photography, and writing. In her “free time,” when she’s not busy working as a horse show secretary or riding her American Quarter Horses on her parents’ Indiana farm, she’s training and competing her Pembroke Welsh Corgi and Swedish Vallhund in dog agility and running.

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