This generally is not the case over the Internet. For a lay person to suggest a diagnosis or treatment for a horse is not sound advice. Part of our training to become veterinary practitioners is to check multiple organ systems, as there are many diseases with complicated symptoms. Someone who has a horse with abnormal behavior might not notice or report over the Internet that the horse has a yellowish color to its gums. To a veterinarian finding this in a physical examination, this would likely lead to blood work to evaluate the condition of the liver.
Liver disease can cause the build-up of substances in the bloodstream causing neurologic symptoms.
A lay person might suggest treatment for EPM, keying in only on the neurologic nature of the described case. The Internet is a wonderful tool, but readers must remain critical in their reading, and not believe everything in print. Consider the source. Remember, though, that this is general information on the disease, and not advice on how to treat your horse being fed your feed, drinking your creek water, etc. Those decisions need to be discussed with a veterinarian who knows your horse's situation.