---
kind: "section"
citation: "21 C.F.R. § 556.510"
title: "21"
number: "556.510"
heading: "Penicillin."
url: "https://uscodex.org/cfr/21/556.510"
---

# §556.510. Penicillin.

- (a) [Reserved]
- (b) **Tolerances.** The tolerances for penicillin are:
  - (1) **Cattle.**
    - (i) **Edible tissues (excluding milk)—** 0.05 ppm.
    - (ii) **Milk—** Zero.
  - (2) **Chickens.** Edible tissues: Zero.
  - (3) **Pheasants and quail.** Edible tissues: Zero.
  - (4) **Sheep and swine.** Edible tissues: Zero.
  - (5) **Turkeys.** Edible tissues (excluding eggs): 0.01 ppm.
- (c) **Related conditions of use.** See §§ [520.1696a](/cfr/21/520.1696a.md), [522.1696a](/cfr/21/522.1696a.md), [522.1696b](/cfr/21/522.1696b.md), [526.1696](/cfr/21/526.1696.md), [526.1697](/cfr/21/526.1697.md), and [526.1698](/cfr/21/526.1698.md) of this chapter.

## Notes

### Amendments

[84 FR 32993, July 11, 2019, as amended at 85 FR 18121, Apr. 1, 2020; 86 FR 13188, Mar. 8, 2021]

### 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; 86 FR 13188, Mar. 8, 2021]