StacksVerified U.S. regulatory reference

21 CFR §520.1326a

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. Each gram of powder contains 83.3 milligrams of mebendazole and 375.0 milligrams of trichlorofon.
  2. (b)Sponsor. See No. 000061 in § 510.600(c) of this chapter.
  3. (c)Conditions of use in horses—(1) Amount. 8.8 milligrams of mebendazole and 40 milligrams of trichlorofon per kilogram of body weight.
    1. (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.)
    2. (3)Limitations. Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.