---
kind: "section"
citation: "21 C.F.R. § 520.1284"
title: "21"
number: "520.1284"
heading: "Liothyronine."
url: "https://uscodex.org/cfr/21/520.1284"
---

# §520.1284. Liothyronine.

- (a) **Specifications.** Each tablet contains 60 or 120 micrograms (µg) liothyronine as the sodium salt.
- (b) **Sponsor.** See No. 054771 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use in dogs—**
  - (1) **Amount.** Administer orally to dogs at levels up to 12.8 µg per kilogram (/kg) of body weight per day. Dosage should be adjusted according to the severity of the condition and the response of the patient. Dosage at the total replacement level (12.8 µg/kg of body weight) should be considered for initiating therapy and then titrated downward for optimum maintenance effect. Twice daily administration is recommended.
  - (2) **Indications for use.** For treatment of hypothyroidism in dogs.
  - (3) **Limitations.** Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[78 FR 28823, May 20, 2014]

### Authority

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

### Source

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

### Amendments

[78 FR 28823, May 20, 2014]