Farnam IverCare (ivermectin paste) 1.87%Remove worms and bots with a single dose of IverCare (ivermectin paste) 1. 87%. This convenient paste offers broad spectrum parasite control and comes in the extended Sure Grip syringe. Proudly made in the U. S. A., it's the only ivermectin product that treats horses up to 1,500 pounds in a single dose. Broad spectrum parasite control The only ivermectin that treats horses up to 1,500 lbs in one dose Available in the easy to use Sure Grip syringe