(Sparhawk Labs) Sparmectin-E is 1% Liquid Ivermectin for oral use in horses. Each ml of Sparmectin-E contains 10 mg ivermectin. One low-volume dose is effective against important internal parasites and bots. Ivermectin liquid may be used in horses of all ages, including mares at any stage of pregnancy. SparMectin-E is administered orally or by stomach tube. The recommended dose is 91 mcg/lb. of body weight; 10 mL treats an 1100 lb. horse. Ivermectin.