Code of Federal Regulations Title 21. Food and Drugs § 21.520.763c Dithiazanine iodide and piperazine citrate suspension

(1) Amount. 1 ounce (30 milliliters) per 100 pounds of body weight for the first 500 pounds;   3/4 ounce for each 100 pounds thereafter, up to 1,200 pounds;  10 1/4 ounces to animals over 1,200 pounds.

(2) Indications for use. For control of large roundworms, Parascaris equorum;  small strongyles;  large strongyles, Strongylus vulgaris;  and pinworms, Oxyuris equi.

(3) Limitations. Administer by drench or mixed with the daily ration as a single dose. Treatment is recommended in spring and fall. In a heavily infested environment, treatment may be repeated every 30 days. Not for use in horses intended for food purposes. Severely debilitated animals should not be wormed except on the advice of a veterinarian. If the drug is for administration by stomach tube, it shall be labeled:  “Federal law restricts this drug to use by or on the order of a licensed veterinarian.”