Pfizer Solitude IGR


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6 lb
Less than $0.57/DAY
(192 day supply)


In Stock. Usually Ships within 24 hours.
20 lb
Less than $0.49/DAY
(640 day supply)


In Stock. Usually Ships within 24 hours.
Shipping weight = 7.00 lbs.


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Product Summary:

Pfizer Solitude IGR™
by Zoetis, formerly Pfizer
For feed-through fly prevention and control of house and stable flies in and around horses, horse barns, stables, paddocks and race tracks. When mixed 1/2 oz. into a horse's ration daily according to the directions, will prevent house and stable fly development. 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.
  • Repeated studies show up to 100% efficacy in inhibiting larvae development.
  • 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.
  • Significant results may be observed within 2 weeks but the full benefit should be realized within 4-6 weeks of administration as the adult populations die off. Solitude IGR™ is intended for use only in equidae including horses, mules and donkeys.
  • Cyromazine, the active ingredient in Solitude IGR™, 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. (Cyromazine has no effect on the chitin of the adult fly.) As the maturing maggots feed on the manure treated with cyromazine, 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 a well documented safety and efficacy profile. It has been extensively evaluated in horses since 2001 as well as intensely studied in other species for more than 20 years. Numerous environmental studies have documented cyromazine's safety for mammals including humans and horses, as well as birds, daphnia, minnows and other indicator species.
  • Once excreted, Solitude IGR™ breaks down to a melamine monomer, a slow release nitrogen fertilizer.
  • Greatly reduces the use of neurotoxic pesticide sprays and overhead fly systems creating a healthier environment for horses, staff and riders.
Item Specifications:

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 which includes appropriate sanitary and management practices to reduce the number and size of fly breeding sites.
To maximize the effectiveness of Solitude IGR™, horses must be fed individually. This product is to be fed top-dressed on grain or mixed with the horse's total ration to provide 300 mg (1 scoop) of cyromazine per horse per day.
Daily dosage: Using 1/2 oz. scoop supplied with the product, mix one (1) 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.
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Downloadable Resources
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Product Reviews by Customers

Rated 4.1 out of 5 by 7 reviewers.
Rated 1 out of 5 by Solitude IGR allergies? I have used this Solitude IGR on my 3 horses since early spring and have noticed no difference in the amount of flies I have around the barn. Also, my horses have all displayed some degree of "itchy butt" and have been rubbing their tails off. I do not know if the product was the cause of this syndrome; however, it started after I started used the product and it is the only new item that they have been exposed to. So I recently discontinued use of the product to see if it would resolve the "itchy butt" syndrome.The product is very expensive and I got no improve fly control. August 8, 2012
Rated 5 out of 5 by superb fly control Palatable. Effective. September 9, 2011
Rated 4 out of 5 by Any allergy issues? Hello, I have used Solitude IGR for three years. The product is as described; the fly issue has dropped dramatically. However, three years ago my mare started having an itchy stomach/rare areas in Feb. Previously, I have blamed this on flies, but this year there were no flies until March 29. I begin Solitude in February as usually the flies begin early here in the desert. It occurred to me that this itching starts in February and I begin IGR in February. Has anyone else had a horse that developed this condition that coincides with the feeding of IGR? March 28, 2011
Rated 4 out of 5 by I've learned my lesson! I used this product for almost 2 years and ran out a couple months ago. I decided to try without and have noticed a huge increase in the fly population. The biggest thing I just came across was that I dispose of the manure into large plastic garbage cans and I opened the lid yesterday and there were thousands of developing fly larvae squiggling around all over the container. This has NEVER happened in the past so I have to figure that the Solitude had been doing an awesome job up until the time I ran out! October 6, 2009
Rated 5 out of 5 by Very pleased with the results The flies are absolutely horrible in my area resulting in some huge vet bills last summer treating summer sores. I've used predators for the last two years but this year I added Solitude to my "fight." I started in Feb as we have a long fly season and I've had very few flies this year. Also, I've not had to use fly spray this year on my horses. I'm also still using predators but the Solitude has really made the difference. Will continue this "forever." Worth it even though it is a bit pricey. Another plus, my horses eat it by itself and wait for me to give it to them. July 15, 2009
Rated 5 out of 5 by Super, Great, The Best I have 2 horses and living in Southeast Louisiana, were bugs are really bad at times, especially since hurricane Katrina. Little black flies were driving my horses and me crazy, nothing worked untill I got Solitude IGR! This product is a life saver. Everyone should try it!!!! June 30, 2009
Rated 5 out of 5 by SolitudeIGR Excellent product -- have 27 horses and it is so simple to add to the feed. I use year round now to prevent even those flies that want to overwinter from getting a head start on me during warmer time of winter. Have used for 2 years and wont use anything other feed thru cause Solitude is so much safer and effective than the other feed thru products for all my horses. Solitude doesn't kill the beneficial insects and invertebrates like other fly products. June 22, 2009
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