The active ingredient in Equest Horse Worming Gel is Moxidectin. Moxidectin works effectively because after the horse has been treated the active ingredient lingers within the system for a futher two weeks, effectively reducing the risk of reinfection and/or pasture contamination. Equest horse wormers are long lasting oral gel which kill the adult and larval stages of important internal parasites. Including encysted developing larval stages of small redworms, arterial stages of large redworms and bots with a single dose. All horses in a yard or grazing together should be included in a regular worming programme and wormed at the same time. Equest horse wormer gel contains 18.92 mg/g moxidectin. The recommended dosing interval of Equest is 13 weeks for your horse or pony. Equest horse wormer is not licensed for use on donkeys. PLEASE NOTE: Do not administer to young foals less than 4 months of age. Equest horse wormers are formulated specifically for use in equines only. Dogs, cats and aquatic life may be adversely affected by the concentration of moxidectin in this product if the used or part-used product is not disposed of safely and responsibly.One syringe of Equest Horse Wormer will treat up to a bodyweight of 575 Kg.