---
kind: "section"
citation: "21 C.F.R. § 520.2123b"
title: "21"
number: "520.2123b"
heading: "Spectinomycin powder."
url: "https://uscodex.org/cfr/21/520.2123b"
---

# §520.2123b. Spectinomycin powder.

- (a) **Specifications.** Each gram (g) of powder contains spectinomycin dihydrochloride pentahydrate equivalent to 0.5 g spectinomycin.
- (b) **Sponsor.** See No. 061133 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.600](/cfr/21/556.600.md) of this chapter.
- (d) **Conditions of use in chickens.** It is administered in the drinking water of growing chickens as follows:
  - (1) **Indications for use and amounts.**
    - (i) As an aid in controlling infectious synovitis due to Mycoplasma synoviae in broiler chickens, administer 1 g per gallon of water as the only source of drinking water for the first 3 to 5 days of life.
    - (ii) **As an aid in the prevention or control of losses due to CRD associated with <I>M.** gallisepticum (PPLO) in growing chickens, administer 2 g per gallon of water as the only source of drinking water for the first 3 days of life and for 1 day following each vaccination.
  - (2) **Limitations.** Do not administer to laying chickens. Do not administer within 5 days of slaughter. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[73 FR 6607, Feb. 5, 2008, as amended at 81 FR 94990, Dec. 27, 2016; 84 FR 8973, Mar. 13, 2019]

### Authority

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

### Source

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

### Amendments

[73 FR 6607, Feb. 5, 2008, as amended at 81 FR 94990, Dec. 27, 2016; 84 FR 8973, Mar. 13, 2019]