21 CFR § 522.533Chapter I

§ 522.533 Deslorelin.

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Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.

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Specifications.(a) (1) Each implant contains 2.1 milligrams (mg) deslorelin acetate.

(2) Each milliliter (mL) of suspension contains 1.8 mg deslorelin acetate.

Sponsors.(b) See sponsor numbers in § 510.600(c) of this chapter as follows:

(1) No. 051311 for use of product described in paragraph (a)(1) as in paragraph (c)(1) of this section.

(2) No. 043264 for use of product described in paragraph (a)(2) as in paragraph (c)(2) of this section.

Conditions of useHorses and poniesAmount.(c) —(1) —(i) One implant per mare subcutaneously in the neck.

Indications for use.(ii) For inducing ovulation within 48 hours in estrous mares with an ovarian follicle greater than 30 millimeters (mm) in diameter.

Limitations.(iii) Do not use in horses or ponies intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

HorsesAmount.(2) —(i) Administer 1.8 mg (1 mL) by intramuscular injection in the neck.

Indications for use.(ii) For inducing ovulation within 48 hours in cyclic estrous mares with an ovarian follicle between 30 and 40 mm in diameter.

Limitations.(iii) 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.

[75 FR 81456, Dec. 28, 2010, as amended at 79 FR 18158, Apr. 1, 2014; 87 FR 17945, Mar. 29, 2022; 87 FR 58962, Sept. 29, 2022]

eCFR data current as of: June 10, 2026

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.