Extralabel Drug Use Readiness under AMDUCA and 21 CFR 530
Separate the veterinarian's decision from the manufacturer's records, and know which uses Part 530 never permits.
In Short
- The veterinarian decides.
- Never in feed.
- No compounding from bulk.
The Veterinary Medicines Guide
The right product, strength and species. Every batch.
- Which rules reach your product
- Supplier to master record
- Dispense, clear, make, test
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The Veterinary Medicines Guide
The right product, strength and species. Every batch.
The Animal Medicinal Drug Use Clarification Act (AMDUCA) and FDA's rules at 21 CFR Part 530 allow approved animal and human drugs to be used in animals outside their labelling, on strict conditions. This guide explains those conditions for veterinarians, pharmacies and the manufacturers whose products they use. It is orientation, not veterinary or legal advice. Sources checked 4 Oct 2026.
The Basic Permission
Section 530.10 says an approved new animal drug or human drug used for an extralabel purpose in an animal is not unsafe, and is exempt from the adequate-directions labelling requirement, only if it is used by or on the lawful written or oral order of a licensed veterinarian within a valid veterinarian-client-patient relationship, and in compliance with Part 530. The permission belongs to the veterinarian's decision.
More on the Basic Permission
Manufacturers should not read it as permission to promote unapproved uses.
Uses that are never permitted
Section 530.11 rules out extralabel use by a lay person not supervised by a veterinarian, extralabel use in or on animal feed, and uses that leave a residue that may present a risk to public health or exceed an established safe level, safe concentration or tolerance. Section 530.41 lists drugs prohibited for extralabel use in food-producing animals, including chloramphenicol, clenbuterol, diethylstilbestrol, nitroimidazoles, nitrofurans, fluoroquinolones and glycopeptides, with conditional entries for others.
Not permitted (530.11)
| Use | Section |
|---|---|
| By a lay person, unsupervised | 530.11(a) |
| In or on animal feed | 530.11(b) |
| Residue risk to public health | 530.11(c) |
| Residue above tolerance | 530.11(d) |
- By a lay person, unsupervised
- Section
- 530.11(a)
- In or on animal feed
- Section
- 530.11(b)
- Residue risk to public health
- Section
- 530.11(c)
- Residue above tolerance
- Section
- 530.11(d)
More on uses that are never permitted
Medicated feed is covered by the separate veterinary feed directive rules.
Labelling of Dispensed Drugs
Section 530.12 requires drugs prescribed or dispensed for extralabel use to carry labelling adequate for safe use, including the prescribing veterinarian, the dispensing pharmacy where relevant, the established name of each active ingredient, directions specified by the veterinarian including the animal or herd identification, any cautionary statements and, for food animals, the withdrawal or discard time. Keep a controlled template and record who checked each label before release.
Worked example: dispensed label RX-V118 (530.12)
Compounding from Approved Drugs Only
Section 530.13 permits compounding from approved animal or human drugs by a veterinarian, or a pharmacist on a veterinarian's order, within veterinary practice, when no approved drug in its available form and concentration will appropriately treat the condition. It does not permit compounding from bulk drugs.
More on compounding from Approved Drugs Only
Compounding from a human drug for food-producing animals is not allowed if an approved animal drug can be used. Record the approved source products and their lots for every compounded preparation.
What manufacturers can control
A manufacturer cannot decide a veterinarian's extralabel use, but it can keep its own records sound: approved labelling under change control, lot genealogy from raw materials to distribution, and complaints and adverse event reports linked to lots and investigated. When a field report suggests extralabel use, people in pharmacovigilance and regulatory decide whether and how to report it.
More on what manufacturers can control
Keep the manufacturer's role and the prescriber's role separate in procedures and training.
Questions
Who can authorise extralabel use?
A licensed veterinarian, within a valid veterinarian-client-patient relationship, under 21 CFR 530.10.
Can approved drugs be used extralabel in feed?
No. Section 530.11(b) does not permit extralabel use in or on animal feed.
Can a pharmacy compound from bulk drug substance under Part 530?
No. Section 530.13(a) says nothing in Part 530 permits compounding from bulk drugs.
Where does V5 fit?
V5 keeps label versions under change control, lot genealogy, complaints and CAPA linked for the manufacturer. Veterinarians and your regulatory team make the clinical and reporting decisions.
Practical orientation, not legal advice. Rules differ by jurisdiction; your quality and compliance team decides what applies.
Keep reading
Veterinary Drug Manufacturing: Lot Control Guide
9 CFR 113: Veterinary Biologics Serial Control and Records
21 CFR 514.8: Postapproval Animal-Drug Change Records
Veterinary Feed Directive (21 CFR 558.6): Feed Mill and Distributor Readiness- VICH Harmonisation Readiness for Veterinary Submissions