TM 2.47 the pharmacist picked up the dog version IVM +pyrantel..
the horse version comes in two forms.. IVM only and IVM+pyrantel..
although pyrantel is not so toxic..
the IVM only form is preferable,
"Pyrantel is a safe, effective, and inexpensive treatment for intestinal worms, and usually cures the condition after a single dose. It has very few side effects and is not known to cause toxicity in humans."