---
kind: "section"
citation: "21 C.F.R. § 556.275"
title: "21"
number: "556.275"
heading: "Fenbendazole."
url: "https://uscodex.org/cfr/21/556.275"
---

# §556.275. Fenbendazole.

- (a) **Acceptable daily intake (ADI).** The ADI for total residue of fenbendazole is 40 µg/kg of body weight per day.
- (b) **Tolerances.** The tolerances for fenbendazole are:
  - (1) **Cattle.**
    - (i) **Liver (target tissue)—** 0.8 ppm fenbendazole (marker residue).
    - (ii) **Milk—** 0.22 ppm fenbendazole sulfoxide (marker residue).
  - (2) **Chickens.**
    - (i) **Liver (target tissue)—** 5.2 ppm fenbendazole sulfone (marker residue).
    - (ii) **Eggs—** 1.8 ppm fenbendazole sulfone (marker residue).
  - (3) **Goats.**
    - (i) **Liver (target tissue)—** 0.8 ppm fenbendazole (marker residue).
    - (ii) [Reserved]
  - (4) **Swine.**
    - (i) **Liver (target tissue)—** 3.2 ppm fenbendazole (marker residue).
    - (ii) [Reserved]
  - (5) **Turkeys.**
    - (i) **Liver (target tissue)—** 6 ppm fenbendazole sulfone (marker residue).
    - (ii) [Reserved]
  - (6) **Quail.**
    - (i) **Liver (target tissue)—** 6 ppm fenbendazole sulfone (marker residue).
    - (ii) [Reserved]
- (c) **Related conditions of use.** See §§ [520.905a](/cfr/21/520.905a.md), [520.905b](/cfr/21/520.905b.md), [520.905c](/cfr/21/520.905c.md), [520.905d](/cfr/21/520.905d.md), and [558.258](/cfr/21/558.258.md) of this chapter.

## Notes

### Amendments

[84 FR 32993, July 11, 2019, as amended at 86 FR 57998, Oct. 20, 2021; 86 FR 61686, Nov. 8, 2021; 89 FR 85428, Oct. 28, 2024]

### Authority

Authority: 21 U.S.C. 342, 360b, 371.

### Source

Source: 84 FR 32993, July 11, 2019, unless otherwise noted.

### Amendments

[84 FR 32993, July 11, 2019, as amended at 86 FR 57998, Oct. 20, 2021; 86 FR 61686, Nov. 8, 2021; 89 FR 85428, Oct. 28, 2024]