21 CFR § 522.2340 - Sulfomyxin.

---
identifier: "/us/cfr/t21/s522.2340"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 522.2340 - Sulfomyxin."
title_number: 21
title_name: "Food and Drugs"
section_number: "522.2340"
section_name: "Sulfomyxin."
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: "522"
part_name: "IMPLANTATION OR INJECTABLE DOSAGE FORM NEW ANIMAL DRUGS"
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. 360b."
regulatory_source: "40 FR 13858, Mar. 27, 1975, unless otherwise noted."
cfr_part: "522"
---


# 522.2340 Sulfomyxin.

(a) *Specifications.* Sulfomyxin for injection is sterile. It is derived from the antibiotic substance produced by the growth of *Bacillus polymyxa* or is the same substance produced by any other means.

(b) *Sponsor.* See No. 054771 in § 510.600(c) of this chapter.

(c) *Special considerations.* The quantities of antibiotic in paragraph (e) of this section refer to the activity of the appropriate standard.

(d) *Related tolerances.* See § 556.700 of this chapter.

(e) *Conditions of use.* (1) It is used or intended for use in chickens and turkeys as an aid in the treatment of disease caused or complicated by *E. coli,* such as colibacillosis and complicated chronic respiratory disease.

(2) It is administered by subcutaneous injection as follows:

|  |  |  |
| --- | --- | --- |
| 1 to 14 | 12,500 | 12,500 |
| 15 to 28 | 25,000 | 25,000 |
| 29 to 63 | 50,000 | 50,000 |
| Over 63 | 50,000 | 100,000 |

(3) A second injection may be given 3 days later if symptoms persist.

(4) Not for use in laying hens; do not treat chickens within 5 days of slaughter. Do not treat turkeys within 7 days of slaughter. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

[40 FR 13858, Mar. 27, 1975, as amended at 79 FR 16196, Mar. 25, 2014; 88 FR 14900, Mar. 10, 2023]