Do horses take medicine for their sickness?

No its not true horses can't be sick there are many sicknesses horses can have one of them is called colic it can kill them if they don't have the proper care when they are sick. If a horse has colic call your vet and then walk the horse around DON'T let him/her lie down because then their guts can get all twisted up and that can kill them so it is not true that horses cannot get sick.

Answer2:

This depends on what you mean by sick. If you mean can they get ill, then yes, there are many sicknesses they can catch.

If however you meant sick as in vomiting, then no, nearly 100% of horses cannot vomit to easy stomach problems, which is why colic is so dangerous for a horse.