Solitude IGR Feed Through Fly Preventive

Regularly: $114.99

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6 lb
Less than $0.45/DAY
(192 day supply)


In Stock. Usually Ships within 24 hours.

20 lb
Less than $0.37/DAY
(640 day supply)


In Stock. Usually Ships within 24 hours.

Shipping weight = 7.00 lbs.


Product Summary:

SOLITUDE® IGR Insect Growth Regulator Feed-Through Fly Preventive
by Zoetis, formerly Pfizer

You can substantially reduce your fly population simply by adding a scoop of SOLITUDE® IGR daily to your horse's feed. Regardless of the farms around you, it will reduce flies at your barn. Use it during fly season to eliminate larvae development. It's economical to use, and safe for other pets that might also be eating your horse's manure.

SOLITUDE® IGR (cyromazine) is a non-organophosphate that has been safely used in horses since 2001 and undergone extensive research to prove its effectiveness and safety. It provides feed-through fly prevention and control of house and stable flies in and around horses, horse barns, stables, paddocks, and race tracks. When mixed into a horse's ration daily according to the directions, it works to prevent house and stable fly development. Significant results may be observed within two weeks, but the full benefit should be realized within four to six weeks of administration as the adult populations die off.

Cyromazine, the active ingredient in SOLITUDE® IGR, has a well-documented safety and efficacy profile, It is an insect growth regulator that works on the fly's chitin exoskeleton and is very species-specific to house and stable flies. As the horse is fed cyromazine, it passes through the horse and is excreted in the manure. House flies and stable flies lay their eggs in the manure and the eggs subsequently hatch into the larval or maggot stage. As the maturing maggots feed on the treated manure, they become unable to successfully develop into adult flies because cyromazine inhibits the proper formation of chitin. The immature stage of the fly dies. Cyromazine has no effect on the chitin of the adult fly.


  • Greatly reduces the need for neurotoxic pesticide sprays and overhead fly systems, creating a healthier environment for horses, staff, and riders
  • Intended for use only in equidae including horses, mules, and donkeys
  • Just one scoop per day per horse, no matter the weight or size of horse
  • Once excreted, breaks down to a melamine monomer, a slow release nitrogen fertilizer
  • Repeated studies show up to 100% efficacy in inhibiting larvae development
  • Studies have proven 99.5% effectiveness against stable flies and 100% effectiveness against house flies, with no effect on horses, other mammals or beneficial insects
Item Specifications:

6 lb. pail (192 doses)
20 lb. pail (640 doses)

Start feeding SOLITUDE® IGR early in the spring before flies begin to appear, and continue feeding throughout the summer and into the fall until cold weather inhibits fly development. In some cases, supplemental fly control measures may be needed in and around paddocks and stables to control adult house flies and stable flies, which can breed not only in manure, but in other decaying vegetable matter or silage on premises. SOLITUDE® IGR will provide a high degree of fly control and will give the best results when integrated with a well-managed fly control program that includes appropriate sanitary and management practices to reduce the number and size of fly breeding sites.

To maximize the effectiveness, horses must be fed individually. Made from alfalfa, these pellets are to be fed top-dressed on grain or mixed with the horse's total ration to provide 300mg of cyromazine per horse per day.
Using 1/2 oz. scoop supplied with the product, mix one scoop of SOLITUDE® IGR in the horse's ration every day.

Do not contaminate water, food or feed by storage and disposal. Wastes resulting from the use of this product may be disposed of on site or at an approved waste disposal facility. Harmful if inhaled or absorbed through the skin. Avoid breathing dust and contact with skin or clothing. May cause skin sensitization reactions in certain individuals. Wash thoroughly with soap and water after handling. Do not apply directly to water.

Downloadable Resources
Product LabelManufacturer Information
MSDS SheetManufacturer Information
Key Benefits & DosageManufacturer Information
Style Item Number Model Number UPC
2 lb SLT101692 002 PFJ 115
6 lb SLT101692 006 026619 1008721908598
20 lb SLT101692 020 026620 087219086001

Product Reviews by Customers

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Browse 11 questions Browse 11 questions and 62 answers
Why did you choose this? Store
There's no guessing about how much to feed different sized horses; everybody gets one scoop. Easy-peasy!
BARBARA H on Feb 1, 2019
I have used this before with great success in our barn.
Brenda L on Jun 24, 2018
There's no guessing about how much to feed different sized horses; everybody gets one scoop. Easy-peasy!
BARBARA H on Feb 1, 2019
I use this year after year and it seems to keep the flies down
Joanne A on Sep 5, 2018
I have used this before with great success in our barn.
Brenda L on Jun 24, 2018
It really works!!!
Kris G on May 22, 2018
Solitude is a great product - it's expensive, but it is worth the cost. It really helps keep the fly population in the barn to a minimum. I've used it for years at my barn.
Kris G on Mar 9, 2018
I especially like that you don't have to adjust the amount added based on horse weight. Along with my Fly Predators, I have really good fly control.
Kathleen R on Jul 26, 2017
been using this for many years now. Wouldn't want to be without it.
Leslie N on Sep 25, 2016
Used before only feed-through that still works AT ALL.
Frank S on Sep 23, 2016
Excellent product for fly control.
Kathleen M on Aug 29, 2016
recommended by my vet. She felt it was the safest feed through.
STEPHANIE M on Jun 8, 2016
the only product that works for fly controll
Andrea K on May 9, 2016
Best Produkt on the market
DANIEL E on Jul 18, 2015
Every little bit helps. One horse gets a little "itchy" when I first start using it, then about a week later he is fine. I use from Easter to Halloween in California.
LYNLEE N on Jul 1, 2015
I have been using this product for 8 years, and it greatly reduces the fly population
KELLY A on Jun 30, 2015
This product works great I have a boarding facility with 48 horses, they are all on it, and we only have about 5% of the flies that we used to. Highly recommend it.
Sara W on Jun 13, 2015
I have been raised around horses and when i bought my horses i tried every feed through, predator flys, as well as old fashion ways, nothing worked. when i'd go visit my mother i noticed the flys where not as bad she has several horses and i only have the two i asked her once if she did any thing special to keep the flys away besides the usual mucking and fly spray. she told me about Solitude IGR and it Works!! I've been using it for years now and hope it never goes away.
Andi K on May 8, 2014
Sounds like it will be the product to do the job for me as I have mares and colts and and various ages of horses.I am willing to try it!
KAY B on May 7, 2014
Got better results than the several other feed through fly control products I've tried. It's expensive but you feed 1/2 the amount of the others which really evens out the price.
JIM E on Apr 28, 2014
have purchased before and satisfied
MICHAEL W on Apr 24, 2014
I worked like a charm last summer. We had a bug free barn!
Mary M on Apr 7, 2014
great product, great price ... free shipping
needed to re-stock for the season
MARCIA G on Mar 19, 2014
Been using this since a few years - one big bucket is enough for an entire year for my two horses. It really keeps the fly population in check. I feed it from March to mid November (SC coastal region).
Regine K on Mar 12, 2014
Excellent product when used correctly. Preparing for spring.
NEANNA G on Feb 16, 2014
I use this year after year and it seems to keep the flies down
Joanne A on Sep 5, 2018
It really works!!!
Kris G on May 22, 2018
does this effect using manure in compost in your garden?
janet l on Mar 31, 2015
BEST ANSWER: Solitude IGRâ„¢ breaks down to a melamine monomer, a slow release nitrogen fertilizer. Please check if this is acceptable for garden compost with your County Extension Agent and your veterinarian.
Is this Solitude IGR safe for eggs for human consumption, layer chickens and ducks who eat the fly larvae that have been treated with the Solitude IGR?
HeatherAnne on Mar 23, 2017
BEST ANSWER: Pfizer shows information that studies have proven it is 99.5% effective against stable flies and 100% effective against house flies with no effect on horses, other mammals or beneficial insects. For information about egg-laying chickens, we would have to refer you directly to Pfizer: or phone 800-879-3477.
Can this be fed to all of my horses? Stud, mares in foal, and yearlings
Rita S on Feb 21, 2017
BEST ANSWER: Absolutely! I love this stuff! I have tried everything on the market but nothing works like Solitude.
what is the largest container available?. I used to be able to get a bigger container.
Kathy B on Mar 10, 2016
BEST ANSWER: The largest container available through us is the 20 pound.
How long does it take once you start feeding it to start working?
A shopper on May 16, 2019
BEST ANSWER: I am not certain exactly how long it takes, I can say for certain that it does work. Like any fly reduction product results are best noticed with time. I have used this product for the past three Summers and am very pleased with it.
My small yorkies often eat horse chips while I'm cleaning stalls. Will this product be detrimental to their health?
A shopper on Aug 30, 2015
BEST ANSWER: I don't know, but I can tell you, that I used this product for 2 years ( switched to fly predators this year) and my dogs ate the "chips" all the time with seemingly no ill effects- I think it worked in their poop too . But, they are much bigger then a yorkie, so he might be a little more delicate. I can't recall their being a warning on the label either. I hope that helps. If I were you- being has he is such a little dog,- I would call the vet and see what they say. It was a very effective product, and I decided to go with the more expensive Solitude, rather then the other ones on the market because i got the impression, after doing a lot of internet "researching", it was safer for the horses and the dogs. HtH
Is this product harmful to dogs or other animals who might ingest the treated manure?
Terry H on Aug 10, 2015
BEST ANSWER: I have 4 horses and over the years have had 5 dogs at one time. I have been feeding Solitude IGR for 4 years. My dogs have the run of the farm and I have never had a problem from the dogs ingesting the treated manure.
Does this have any affect on lice?
leigh a on May 30, 2017
BEST ANSWER: I'm sure it doesn't. It's formulated to kill the fly larvae in the feces. Different life cycle for lice.
What is the shelf life?
Maggie K on Sep 6, 2018
BEST ANSWER: All I can say is I had half a 20 lb bucket left at the end of summer last year. I closed it up and put it away and was glad I had it in the spring. It was available to start for my five horses as soon as I saw the flies appear. I didn't have to wait to order. It seemed to work just fine. Beyond that I don't know. I think you would have to ask the manufacturers that.
What shots do I need to give my donkey?
A shopper on Apr 3, 2015
BEST ANSWER: It depends on many factors. Please contact your local veterinarian.