Horse Tack Review

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Equine Resources International, LLC

Solitude IGR™, the newest introduction from Pfizer Animal Health, will provide horse owners with a safe, simple and effective way to reduce fly populations beginning this season. Solitude IGR is a scientifically advanced feed-through fly preventive that uses no dangerous organophosphates and will revolutionize the way equine facilities manage their fly problems.

The active ingredient in Solitude IGR has been shown in multiple studies to be up to 100% effective against house and stable flies. The product is also safe for both horses and the environment. To achieve these results, owners need only top dress their horses’ feed with one-half ounce of Solitude IGR daily. While significant results may be observed within two weeks, the full effect is usually realized in 4- 6 weeks as the adult flies die off.

“As owners, we spend hundreds of dollars every fly season on products that might repel flies for a while, but that do nothing to prevent the problem,” said Dan Kramer, Senior Marketing Manager, Equine Division, at Pfizer Animal Health. “Solitude IGR will reduce the need for expensive sprays and other types of fly control in addition to creating a healthier environment for both horses and humans.”

“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.

When a horse is fed Solitude IGR, the product quickly passes through the animal, exiting in the manure. Female flies lay their eggs in that manure on pastures and in stables, thus bringing their eggs into contact with Solitude IGR. The eggs hatch into larvae, but they are unable to become adults because cyromazine interferes with the formation of chitin as they molt. Larvae in the manure then die before ever emerging as adult flies.

This unique mode of action makes Solitude IGR safe. Cyromazine has been used for over 20 years in the poultry industry. Mammals, such as humans and horses, do not produce chitin, so cyromazine has no effect on them.

“Owners can use Solitude IGR with confidence in both its safety and its efficacy,” said Dr. Bob Dressler, Manager, Equine Veterinary Operations for Pfizer. “This product will help significantly reduce the number of flies that plague horses, without creating any worries about toxicity for humans, horses, other animals, plants or water supplies.”

Solitude IGR is an integral part of a sound, overall pest management program. Owners must also practice good basic barn hygiene—regularly mucking 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 areas.

For more information on Solitude IGR, visit

For more information on Pfizer Animal Health’s complete line of equine health care products, visit Pfizer Inc discovers, develops, manufactures and markets leading prescription medicines, for humans and animals, and many of the world’s best known consumer products.