21 CFR § 556.510 - Penicillin.

---
identifier: "/us/cfr/t21/s556.510"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 556.510 - Penicillin."
title_number: 21
title_name: "Food and Drugs"
section_number: "556.510"
section_name: "Penicillin."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "556"
part_name: "TOLERANCES FOR RESIDUES OF NEW ANIMAL DRUGS IN FOOD"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 342, 360b, 371."
regulatory_source: "84 FR 32993, July 11, 2019, unless otherwise noted."
cfr_part: "556"
---


# 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, 522.1696a, 522.1696b, 526.1696, 526.1697, and 526.1698 of this chapter.

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