21 CFR § 520.28 - Acetazolamide.

---
identifier: "/us/cfr/t21/s520.28"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.28 - Acetazolamide."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.28"
section_name: "Acetazolamide."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "520"
part_name: "ORAL DOSAGE FORM NEW ANIMAL DRUGS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 360b."
regulatory_source: "40 FR 13838, Mar. 27, 1975, unless otherwise noted."
cfr_part: "520"
---


# 520.28 Acetazolamide.

(a) *Specifications.* A powder containing acetazolamide sodium, USP equivalent to 25 percent acetazolamide activity.

(b) *Sponsor.* See No. 054771 in § 510.600(c) of this chapter.

(c) *Conditions of use in dogs*—(1) *Amount.* Administer orally at a dosage of 5 to 15 milligrams per pound of body weight daily.

(2) *Indications for use.* As an aid in the treatment of mild congestive heart failure and for rapid reduction of intraocular pressure.

(3) *Limitations.* Federal law restricts this drug to use by or on the order of a licensed veterinarian.

[79 FR 28816, May 20, 2014]