520.1326a—Mebendazole and trichlorfon powder.
(a) Specifications.
Each gram of powder contains 83.3 milligrams of mebendazole and 375.0 milligrams of trichlorofon.
(c) Conditions of use. Horses—
(1) Amount.
8.8 milligrams of mebendazole and 40 milligrams of trichlorofon per kilogram of body weight.
(2) Indications for use.
It is used in horses for the treatment of infections of bots (Gastrophilus intestinalis and G. nasalis ), large roundworms (Parascaris equorum ), large strongyles (Strongylus edentatus, S. equinus, S. vulgaris ), small strongyles, and pinworms (Oxyuris equi.)
(3) Limitations.
Administer orally as an individual dose by stomach tube or throughly mixed in the ground grain portion of the ration to be consumed in one feeding. Discard treated feed not consumed. Do not administer more than once every 30 days. Do not treat sick or debilitated animals, foals under 4 months of age, or mares in the last month of pregnancy. Trichlorofon is a cholinesterase inhibitor. Do not administer simultaneously or within a few days before or after treatment with, or exposure to, cholinesterase-inhibiting drugs, pesticides or chemicals. Do not administer intravenous anesthetics, especially muscle relaxants, concurrently. Not for horses intended for food use. Federal law restricts this drug to use by or on the order of a licensed veterinarian.