StacksVerified U.S. regulatory reference

21 CFR §556.275

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Acceptable daily intake (ADI). The ADI for total residue of fenbendazole is 40 µg/kg of body weight per day.
  2. (b)Tolerances. The tolerances for fenbendazole are:
    1. (1)Cattle.
      1. (i)Liver (target tissue): 0.8 ppm fenbendazole (marker residue).
      2. (ii)Milk: 0.22 ppm fenbendazole sulfoxide (marker residue).
    2. (2)Chickens.
      1. (i)Liver (target tissue): 5.2 ppm fenbendazole sulfone (marker residue).
      2. (ii)Eggs: 1.8 ppm fenbendazole sulfone (marker residue).
    3. (3)Goats.
      1. (i)Liver (target tissue): 0.8 ppm fenbendazole (marker residue).
      2. (ii)[Reserved]
    4. (4)Swine.
      1. (i)Liver (target tissue): 3.2 ppm fenbendazole (marker residue).
      2. (ii)[Reserved]
    5. (5)Turkeys.
      1. (i)Liver (target tissue): 6 ppm fenbendazole sulfone (marker residue).
      2. (ii)[Reserved]
    6. (6)Quail.
      1. (i)Liver (target tissue): 6 ppm fenbendazole sulfone (marker residue).
      2. (ii)[Reserved]
  3. (c)Related conditions of use. See §§ 520.905a, 520.905b, 520.905c, 520.905d, and 558.258 of this chapter.