"For over 17 years, ivermectin, the active ingredient in IverCare has been the dewormer of choice for savvy horse owners. IVERCARE (ivermectin) kills 35 stages of worms and bots combined in a single dose, providing broad spectrum parasite control. With a wide margin of safety, IVERCARE can be used on horses of all ages without age restrictions. Even young foals. IVERCARE can safely be used on broodmares at any stage of pregnancy and breeding stallions. Only ivermectin, the active ingredient in IVERCARE, controls all three life stages of the two most common bot species that threaten horses: Gastrophilus intestinalis and Gastrophilus nasalis, offering protection all year long. Treats horses up to 1,500 lbs. in a single dose."