21 CFR § 556.300 - Gentamicin.

---
identifier: "/us/cfr/t21/s556.300"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 556.300 - Gentamicin."
title_number: 21
title_name: "Food and Drugs"
section_number: "556.300"
section_name: "Gentamicin."
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"
---


# 556.300 Gentamicin.

(a) *Acceptable daily intake (ADI).* The ADI for total residue of gentamicin is 60 µg/kg of body weight per day.

(b) *Tolerances.* The tolerances for gentamicin are:

(1) *Chickens and turkeys.* Edible tissues (excluding eggs): 0.1 ppm.

(2) *Swine.* (i) Liver: 0.3 ppm.

(ii) Kidney (target tissue): 0.4 ppm gentamicin (marker residue).

(iii) Fat: 0.4 ppm.

(iv) Muscle: 0.1 ppm.

(c) *Related conditions of use.* See §§ 520.1044a, 520.1044b, 520.1044c, 522.1044, 524.1044e, and 529.1044b of this chapter.

[84 FR 32993, July 11, 2019, as amended at 86 FR 13188, Mar. 8, 2021]