---
kind: "section"
citation: "21 C.F.R. § 556.765"
title: "21"
number: "556.765"
heading: "Zilpaterol."
url: "https://uscodex.org/cfr/21/556.765"
---

# §556.765. Zilpaterol.

- (a) **Acceptable daily intake (ADI).** The ADI for total residue of zilpaterol is 0.083 µg/kg of body weight per day.
- (b) **Tolerances.** The tolerance for zilpaterol freebase (marker residue) is:
  - (1) **Cattle.**
    - (i) **Liver (target tissue)—** 12 ppb.
    - (ii) **Muscle—** 10 ppb.
  - (2) [Reserved]
- (c) **Related conditions of use.** See [§ 558.665](/cfr/21/558.665.md) of this chapter.

## Notes

### Amendments

[84 FR 32993, July 11, 2019, as amended at 85 FR 18121, Apr. 1, 2020]

### 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 85 FR 18121, Apr. 1, 2020]