21 CFR § 520.2260c - Sulfamethazine sustained-release tablets.

---
identifier: "/us/cfr/t21/s520.2260c"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.2260c - Sulfamethazine sustained-release tablets."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.2260c"
section_name: "Sulfamethazine sustained-release tablets."
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: "520"
part_name: "ORAL 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 13838, Mar. 27, 1975, unless otherwise noted."
cfr_part: "520"
---


# 520.2260c Sulfamethazine sustained-release tablets.

(a) *Specifications.* Each extended-release tablet contains 8 grams sulfamethazine.

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

(c) *Related tolerances.* See § 556.670 of this chapter.

(d) *Conditions of use*—(1) *Amount.* 8 grams (1 tablet) per 45 pounds of body weight as a single dose.

(2) *Indications for use.* In calves for sustained treatment of pneumonia caused by *Pasteurella* spp., colibacillosis (bacterial scours) caused by *Escherichia coli;* and calf diptheria caused by *Fusobacterium necrophorum.*

(3) *Limitations.* Treated animals must not be slaughtered for food within 18 days after the latest treatment. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

[48 FR 26763, June 10, 1983, as amended at 56 FR 50653, Oct. 8, 1991; 59 FR 22754, May 3, 1994; 61 FR 4875, Feb. 9, 1996; 79 FR 28830, May 20, 2014]