IverCare Equine Oral Paste by Farnam (1.87% Ivermectin). IverCare Oral Paste by Farnam offers a convenient, single-dose oral paste with 1.87% ivermectin. The red apple-flavored formula comes in a calibrated syringe, making it easy to administer to horses weighing up to 1,250 lbs. A popular choice for rotational equine care routines, IverCare fits seamlessly into seasonal care programs.