---
kind: "section"
citation: "21 C.F.R. § 522.2474"
title: "21"
number: "522.2474"
heading: "Tolazoline."
url: "https://uscodex.org/cfr/21/522.2474"
---

# §522.2474. Tolazoline.

- (a) **Specifications.** Each milliliter of solution contains tolazoline hydrochloride equivalent to 100 milligrams (mg) of base activity.
- (b) **Sponsor.** See No. 059399 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use in horses—**
  - (1) **Amount.** Administer slowly by intravenous injection 4 mg per kilogram of body weight or 1.8 mg per pound (4 milliliters (mL) per 100 kilograms or 4 mL per 220 pounds).
  - (2) **Indications for use.** For use in horses when it is desirable to reverse the effects of sedation and analgesia caused by xylazine.
  - (3) **Limitations.** Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[79 FR 16197, Mar. 25, 2014, as amended at 79 FR 74020, Dec. 15, 2014; 80 FR 13230, Mar. 13, 2015]

### Authority

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

### Source

Source: 40 FR 13858, Mar. 27, 1975, unless otherwise noted.

### Amendments

[79 FR 16197, Mar. 25, 2014, as amended at 79 FR 74020, Dec. 15, 2014; 80 FR 13230, Mar. 13, 2015]