Banned substances- Substances that are deemed by the FEI to have no legitimate use in equine medicine and/or have a high potential for abuse (e.g., human antidepressants, nervous system stimulants, etc.). These simply should not be found in any horse at any level at any time. Controlled Medication substances- A list of medication that is prohibited in competition but has therapeutic properties. This list is made up of all commonly used substances that have the potential to enhance performance such as anti-inflammatories. Substances on this list may also enhance performance depending on the timing and size of the dose.