Solitude IGR™ is a safe, effective and easy to use fly
preventative that can help to reduce house and stable fly populations this spring and summer.
Containing no potentially harmful organophosphates, Solitude IGR utilizes scientifically
advanced technology to break the fly life cycle and stop infestations before they start.
Two of the most common types of flies found near equine facilities, house and stable
flies, become active and breed in large numbers once temperatures remain above 50°F. Solitude
IGR is up to 100% effective against these pests—which have been implicated in the spread of
more than sixty diseases. To achieve these results, owners need only top dress their horses’ feed
with one-half ounce of Solitude IGR daily. Significant results may be observed in just two weeks,
with the full effects realized in four to six weeks as the adult flies die off. Many studies have
shown that Solitude IGR is safe for both horses and the environment.
“Solitude IGR is a product that owners can use with a great deal of confidence in its
safety and efficacy,” said Jay Donecker, VMD, Senior Veterinarian at Pfizer Animal Health.
“Solitude IGR has been proven to help significantly reduce the number of flies that plague horses
without creating toxicity issues for humans, horses, other animals, plants or water supplies.”
“IGR” stands for insect growth regulator—which is the very basic explanation for how
Solitude IGR works. Cyromazine, the product’s principal active ingredient, interferes with the
production of chitin in house and stable flies. Chitin is a compound that makes up the
exoskeleton—the hard outer shell—of many insects.
Top-dressed onto a horse’s feed daily, Solitude IGR passes safely through the horse’s
digestive system into manure. House and stable flies lay their eggs in the manure, thus bringing
the eggs in contact with Solitude IGR. Once the eggs hatch into larvae, Solitude IGR inhibits the
production of chitin in the larvae. Unable to properly form a protective outer shell as it grows, the
immature stage of the fly dies without ever reaching adulthood.
Because Solitude IGR targets systems unique to insects, it has a high degree of safety for
mammals such as humans and horses. The active ingredient in Solitude IGR has been studied
extensively in mammals for 20 years. Solitude IGR will not contaminate pastures, plants or water
supplies, and is safe for horses of all ages.
Solitude IGR is an integral part of an overall pest management program that includes
basic barn hygiene—regularly mucking out stalls and properly removing manure. Some use of fly
repellents or bait systems may still be necessary to control flies that migrate from other, untreated
For more information on Solitude IGR, visit www.solitudeIGR.com.
For more information on Pfizer Animal Health’s complete line of equine health care
products, visit www.pfizer.com/equine. Pfizer Inc discovers, develops, manufactures and
markets leading prescription medicines, for humans and animals, and many of the world’s best
known consumer products.