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Farnam's SimpliFly is a feed supplement for horses that prevents stable and house flies from living in your horse's manure. This supplement concludes the life cycle of fly larvae by impeding their exoskeleton's formation, ultimately killing any potential new larvae. SimpliFly is considered a reduced risk pesticide, making it safe to use for pest management. 


  • Eliminates flies by breaking their life cycle
  • Used as an added supplement to grain
  • Prevents development of house and stable flies
  • Safe to use for pest management efforts 


Mix in with daily grain meals. Start feeding in the spring before the flies appear, continue until cold weather. Not for use in pregnant mares or stallions. Dosage recommendations based on weight are as follows:

300-500 lb: feed 2/5 oz. per day
500-700 lb: feed 3/5 oz. per day
700-900 lb: feed 4/5 oz. per day
900-1100 lb: feed 1 oz. per day
1100-1300 lb: feed 1 1/5 oz. per day

For horses over 1300 lb or draft horses: feed an additional 1/5 oz. for each additional 200 lbs of body weight. 


Keep out of reach of children. Feed the recommended portion. Store in a cool, dry location. 


Diflubenzuron, Wheat Middlings, Dehydrated Alfalfa Meal, Calcium Carbonate, Sodium Chloride, Calcium Propionate (preservative)

Ratings & Reviews

3 reviews

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It's proven spent $900.00 to find Simplifly does not work!!!


I tried this for 4 months straight! I was also using canister fly sprays in each stall. I ran out of the fly spray because China didn't have the little nozzles for the sprayers so I no fly spray for 2 months. During the time the fly spray and the simplify were going at the same time the flys had decreased a bunch, I was ecstatic! Without the fly spray for those two months, the flys were back in hordes meaning the Simplify really had nothing to do with the less amount of flys it was the fly spray doing the work. I spent $900.00 for 4 months on Simplifly. Save your money! If you find something that actually works let me and Farmvet know. Buy the canisters put them everywhere they work. You can get the unit at janitorial places for a fraction of the cost but you still need Farmvet for the actual replacement sprays.

No flies = happy horses and people.


Best and most affordable fly product ever as long as 70% of horse in area receive it. Over 100 horses at the stable I board and with widespread participation there are not many flies. No other products needed.

Best Fly Control


I have been using Simplifly for over 15 years. There's a reason. It works.