Controlling Parasites in Your Horse

Ivermectin as an over-the-counter (OTC) chemical dewormer indicated for controlling parasites in horses. Left untreated, parasites cause inflammation, ulcers and damage your horse’s intestinal lining. Also, certain types of parasites are thought to contribute to colic, anemia, and nutritional deficiencies.

FDA has requested that drug companies add information about antiparasitic resistance to both over-the-counter (OTC) and prescription dewormers (e.g., ivermectin). The OTC label must have adequate directions for use that are written in such a way that a non-veterinarian can use the drug safely and effectively.