eCFR Reference Browser

---

title: "21 CFR §558.363"

source: "https://www.ecfr.gov/current/title-21/section-558.363"

title_number: "21"

volume_number: "6"

chapter_number: "Unknown"

subchapter_code: "E"

subchapter_subject: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"

part_code: "558"

part_subject: "NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS"

subpart_code: "B"

subpart_subject: "Specific New Animal Drugs for Use in Animal Feeds"

section_number: "558.363"

section_subject: "Narasin."

cfr_reference: "21 CFR 558.363"

title_name: "Title 21"

title_subject: "Food and Drugs"

parts_covered: "Parts 500 to 599"

revised_date: "Revised as of April 1, 2019"

publication_date: "As of April 1, 2019"

contains_description: "Containing a codification of documents of general applicability and future effect"

publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"

---

(a)Specifications. Type A medicated articles containing 36, 45, 54, 72, and 90 grams narasin per pound.

(b)Sponsor. See No. 058198 in § 510.600(c) of this chapter.

(c)Tolerances. See § 556.428 of this chapter.

(d)Special considerations. An expiration date of 2 months (8 weeks) is required for narasin Type C medicated swine feeds.

(e)Conditions of use. It is used as follows:

(1)Chickens—

(2)Swine—

(3)Narasin single-ingredient Type A medicated articles may also be used in combination with:

(i)Avilamycin as in § 558.68.

(ii)[Reserved]

§558.363 - Narasin.