Equell ivermectin Paste by Pfizer. $8.38. Contains 1.87% ivermectin. For use in horses of all ages, including mares at any stage of pregnancy, for the removal & control of large and small strongyles, pinworms, ascarids, hairworms, stomach worms, bots, lungworms and threadworms. Each syringe treats up to 1,320 lbs body wt.. Save 43%!