---
kind: "section"
citation: "21 C.F.R. § 520.2345c"
title: "21"
number: "520.2345c"
heading: "Tetracycline boluses."
url: "https://uscodex.org/cfr/21/520.2345c"
---

# §520.2345c. Tetracycline boluses.

- (a) **Specifications.** Each bolus contains 500 milligrams of tetracycline (as the hydrochloride).
- (b) **Sponsor.** See No. 054771 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.720](/cfr/21/556.720.md) of this chapter.
- (d) **Conditions of use. Calves—**
  - (1) **Amount.** 10 milligrams per pound of body weight per day in divided doses.
    - (i) **Indications for use.** Control and treatment of bacterial enteritis (scours) caused by E. coli and bacterial pneumonia caused by Pasteurella spp., Hemophilus spp., and Klebsiella spp.
    - (ii) **Limitations.** Administer orally for 3 to 5 days; do not slaughter animals for food within 14 days of treatment; use as sole source of tetracycline.
  - (2) **Amount.** 10 milligrams per pound of body weight per day in two divided doses.
    - (i) **Indications for use.** Treatment of bacterial pneumonia caused by organisms susceptible to tetracycline, bacterial enteritis caused by E. coli, and salmonella organisms susceptible to tetracycline.
    - (ii) **Limitations.** Administer orally for not more than 5 days; do not slaughter animals for food within 12 days of treatment; use as sole source of tetracycline.

## Notes

### Amendments

[57 FR 37328, Aug. 18, 1992, as amended at 67 FR 78355, Dec. 24, 2002; 79 FR 28831, May 20, 2014; 81 FR 67151, Sept. 30, 2016]

### Authority

Authority: 21 U.S.C. 360b.

### Source

Source: 40 FR 13838, Mar. 27, 1975, unless otherwise noted.

### Amendments

[57 FR 37328, Aug. 18, 1992, as amended at 67 FR 78355, Dec. 24, 2002; 79 FR 28831, May 20, 2014; 81 FR 67151, Sept. 30, 2016]