21 C.F.R. § 520.905b
Fenbendazole granules.
Cite as 21 C.F.R. § 520.905b (2026)
(a)
Specifications.
Each gram of granules contains 222 milligrams (mg) fenbendazole.
(b)
Sponsor.
See No. 000061 in § 510.600(c) of this chapter.
(c)
Special considerations.
See § 500.25 of this chapter.
(d)
Conditions of use
—(1)
Horses
—(i)
Amount.
5 mg/kilogram (kg) for large strongyles, small strongyles, and pinworms; 10 mg/kg for ascarids.
(ii)
Indications for use.
For the control of infections of large strongyles (
Strongylus edentatus, S. equinus, S. vulgaris
), small strongyles, pinworms (
Oxyuris equi
), and ascarids (
Parascaris equorum
).
(iii)
Limitations.
Sprinkle the appropriate amount of drug on a small amount of the usual grain ration. Prepare for each horse individually. Withholding feed or water is not necessary. Retreat in 6 to 8 weeks if required. Do not use in horses intended for food.
(2)
Dogs
—(i)
Amount.
50 mg/kg daily for 3 consecutive days.
(ii)
Indications for use.
For the treatment and control of ascarids (
Toxocara canis, Toxascaris leonina
), hookworms (
Ancylostoma caninum, Uncinaria stenocephala
), whipworms (
Trichuris vulpis
), and tapeworms (
Taenia pisiformis
).
(iii)
Limitations.
Mix the appropriate amount of drug with a small amount of the usual food; dry dog food may require slight moistening to facilitate mixing. Medicated food must be fully consumed.
(3)
Zoo and wildlife animals
—(i)
Amount.
10 mg/kg per day for 3 days.
(ii)
Indications for use.
For control of internal parasites of
Felidae
and
Ursidae
as follows:
(A) Lion (
Panthera leo
) and Tiger (
Panthera tigris
): Ascarid (
Toxocara cati, Toxascaris leonina
), Hookworm (
Ancylostoma
spp.).
(B) Cheetah (
Acinonyx jubatus
): Ascarid (
Toxocara cati, Toxascaris leonina
).
(C) Puma (
Felis concolor
), Panther (
Panthera
spp.), Leopard (
Panthera pardus
), Jaguar (
Panthera onca
): Ascarid (
Toxocara cati, Toxascaris leonina
), Hookworm (
Ancylostoma
spp.), Tapeworm (
Taenia hydatigena, T. krabbei, T. taeniaeformis
).
(D) Black Bear (
Ursus americanus
): Ascarid (
Baylisascaris transfuga, Toxascaris leonina
), Hookworm (
Ancylostoma caninum
), Tapeworm (
Taenia hydatigena, T. krabbei
).
(E) Polar Bear (
Ursus maritimus
) and Grizzly Bear (
Ursus horribilis
): Ascarid (
Baylisascaris transfuga, Toxascaris leonina
).
(iii)
Limitations.
Top dress or mix with a small portion of food. Must be fully consumed prior to feeding. Federal law restricts this drug to use by or on the order of a licensed veterinarian. Do not use 14 days before or during the hunting season.
[44 FR 1375, Jan. 5, 1979, as amended at 47 FR 15327, Apr. 9, 1982; 48 FR 50528, Nov. 2, 1983; 59 FR 35252, July 11, 1994; 66 FR 47960, Sept. 17, 2001; 67 FR 47450, July 19, 2002; 71 FR 19429, Apr. 14, 2006; 74 FR 61516, Nov. 25, 2009]
- Cross-references to the CFR
- 500.25510.600