---
kind: "section"
citation: "21 C.F.R. § 520.823"
title: "21"
number: "520.823"
heading: "Erythromycin."
url: "https://uscodex.org/cfr/21/520.823"
---

# §520.823. Erythromycin.

- (a) **Specifications.** Each gram of powder contains erythromycin phosphate equivalent to 0.89 gram of erythromycin master standard.
- (b) **Sponsor.** See No. 061133 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.230](/cfr/21/556.230.md) of this chapter.
- (d) **Conditions of use.** It is used in drinking water as follows:
  - (1) **Broiler and replacement chickens—**
    - (i) **Amount.** Administer 0.500 gram per gallon for 5 days.
    - (ii) **Indications for use.** As an aid in the control of chronic respiratory disease due to Mycoplasma gallisepticum susceptible to erythromycin.
    - (iii) **Limitations.** Do not use in replacement pullets over 16 weeks of age. Do not use in chickens producing eggs for human consumption. Withdraw 1 day before slaughter. Federal law restricts this drug to use by or on the order of a licensed veterinarian.
  - (2) **Replacement chickens and chicken breeders—**
    - (i) **Amount.** Administer 0.500 gram per gallon for 7 days.
    - (ii) **Indications for use.** As an aid in the control of infectious coryza due to Haemophilus gallinarum susceptible to erythromycin.
    - (iii) **Limitations.** Do not use in replacement pullets over 16 weeks of age. Do not use in chickens producing eggs for human consumption. Withdraw 1 day before slaughter. Federal law restricts this drug to use by or on the order of a licensed veterinarian.
  - (3) **Growing turkeys—**
    - (i) **Amount.** Administer 0.500 gram per gallon for 7 days.
    - (ii) **Indications for use.** As an aid in the control of blue comb (nonspecific infectious enteritis) caused by organisms susceptible to erythromycin.
    - (iii) **Limitations.** Do not use in turkeys producing eggs for human consumption. Withdraw 1 day before slaughter. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[40 FR 13838, Mar. 27, 1975, as amended at 45 FR 56798, Aug. 26, 1980; 66 FR 14073, Mar. 9, 2001; 68 FR 4914, Jan. 31, 2003; 79 FR 28821, May 20, 2014; 81 FR 17607, Mar. 30, 2016; 81 FR 94989, Dec. 27, 2016; 84 FR 8972, Mar. 13, 2019]

### Authority

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

### Source

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

### Amendments

[40 FR 13838, Mar. 27, 1975, as amended at 45 FR 56798, Aug. 26, 1980; 66 FR 14073, Mar. 9, 2001; 68 FR 4914, Jan. 31, 2003; 79 FR 28821, May 20, 2014; 81 FR 17607, Mar. 30, 2016; 81 FR 94989, Dec. 27, 2016; 84 FR 8972, Mar. 13, 2019]