Pfizer Solitude IGR


Eligible for free e-certification with purchase
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.


Sometimes, manufacturers require that products be advertised only at their suggested prices. When we choose to sell these items for less, we display the sale price only in the cart. To see the price, click Add to Cart.


Frequently Bought Together:

Sometimes, manufacturers require that products be advertised only at their suggested prices. When we choose to sell these items for less, we display the sale price only in the cart. To see the price, click Add to Cart.

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.
Downloadable Resources
MSDS SheetManufacturer Information

Product Reviews by Customers

Browse 4 questions and 30 answers
Hide answersShow all answers | Sort by
Why did you choose this? Store
To lower the amount of flies out at my barn.
Tammy P on Sep 15, 2015
Part of my fly prevention program.
Tawni M on Aug 24, 2015
Heard good things about it and thought I would give it a try.
Steve C on Aug 29, 2015
Running out
Linda T on Jul 6, 2015
We also have two mini donkeys besides three horses my question is do we give the donkeys the same amount of solitude as the horses in their supplement dish? thank you dblm ranch
Margaret N on Jan 13, 2015
Best Answer: We have welsh ponies, weight around 500# ea and we give them a scoop. One of our mares had kidney disease and we especially asked our vet about that issue. She phoned the Pfizer co and they said it was ok, we never had a problem. If you want to know for sure, you could probably call Pfizer, they must have a customer service dept. We've used it for five years and are very happy with it. Our manure pile is close and we have had minimal problems, even in August/Sept which are our worst months. We tried the bugs, but this is great.
Reply · Report · Heather V on Jan 26, 2015
· Add Answer · I Have This Question Too (1)
how long will the 6lbs last 5 horses?
Vicki H on May 4, 2015
Best Answer: It's one ounce per day per animal no matter what weight the animal, I believe, so you can figure from that. Also, you can call the customer service for Pfizer and they would let you know exactly. The state line tack description also says a day supply on the description page, so that would also be a way to figure. We have four animals and I order 2/year and use about 9 pounds of it and have "left overs" for the next year. Actually I'm glad you asked because I need to order another six pounds. It's very to feed, sprinkle it in the feed you use, and it works very well. Better, I think, than the insects. We have our manure pile about 100 feet from the house and have never had a fly problem by the house, except in very late summer and those flies are hard to get away from whatever we've used.
Reply · Report · Heather V on May 4, 2015
· Add Answer · I Have This Question Too (0)
How long can this product be stored indoors before it is no longer effective? Does the 10% auto ship apply to the discounted price today?
A shopper on Jan 7, 2015
· Add Answer · I Have This Question Too (0)