---
kind: "section"
citation: "21 C.F.R. § 520.1422"
title: "21"
number: "520.1422"
heading: "Metoserpate hydrochloride."
url: "https://uscodex.org/cfr/21/520.1422"
---

# §520.1422. Metoserpate hydrochloride.

- (a) **Chemical name.** Methyl-o-methyl-18-epireserpate hydrochloride.
- (b) **Sponsor.** See No. 054771 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.410](/cfr/21/556.410.md) of this chapter.
- (d) **Conditions of use.** It is used in drinking water for replacement chickens as follows:
  - (1) **Amount.** 568.5 milligrams per gallon (0.015 percent).
    - (i) **Indications for use.** As a tranquilizer for flock treatment of chickens prior to handling.
    - (ii) **Limitations.** To be used one time as a treatment for replacement chickens up to 16 weeks of age; usual drinking water should be withheld prior to treatment to provide adequate consumption of medicated drinking water; not for use in laying chickens; chickens slaughtered within 72 hours following treatment must not be used for food.
  - (2) **Amount.** 2 to 4 milligrams per 2.2 pounds of body weight.
    - (i) **Indications for use.** As an aid in control of hysteria.
    - (ii) **Limitations.** To be used as a treatment for replacement chickens up to 16 weeks of age; usual drinking water should be withheld prior to treatment to provide adequate consumption of medicated drinking water; the drug should be administered at a dosage level of 4 milligrams per 2.2 pounds of body weight followed by 2 treatments at 4-day intervals of 2 milligrams per 2.2 pounds of body weight; not for use in laying chickens; chickens slaughtered within 72 hours following treatment must not be used for food.

## Notes

### Amendments

[40 FR 13838, Mar. 27, 1975, as amended at 76 FR 17337, Mar. 29, 2011; 78 FR 28824, May 20, 2014]

### 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 76 FR 17337, Mar. 29, 2011; 78 FR 28824, May 20, 2014]