Contains Nonbinding Recommendations 
 
72 
Guidance for Industry 
 
GMP'S FOR MEDICATED FEED  
MANUFACTURERS NOT REQUIRED TO REGISTER 
AND BE  LICENSED WITH FDA 
(October 21, 2010, this guidance document was revised to update contact information and to correct broken 
internet links) 
 
This document is intended to help manufacturers of medicated feed, that are not required to 
register and be licensed with the FDA, comply with the Current Good Manufacturing Practice 
regulations, 21 CFR 225.120-225.202. 
Submit comments on this guidance at any time.  Submit written comments to the Division of 
Dockets Management (HFA-305), Food and Drug Administration, 5630 Fishers Lane, Room 
1061, Rockville, MD 20852.  Comments may also be submitted electronically on the Internet at 
http://www.regulations.gov.   
For questions regarding this guidance document, contact Jo Gulley, Center for Veterinary 
Medicine, HFV-226, Food and Drug Administration, 7519 Standish Place, Rockville, MD 
20855, 240-453-6858, email Jo.Gulley@fda.hhs.gov.  
Additional copies of this guidance document may be requested from the Communications Staff, 
HFV-12, Center for Veterinary Medicine, U.S. Food and Drug Administration, 7519 Standish 
Place, Rockville, MD  20855, and may be viewed on the Internet at 
http://www.fda.gov/AnimalVeterinary/default.htm.  
U.S. Department of Health and Human Services 
Food and Drug Administration 
Center for Veterinary Medicine 
May 1998  Contains Nonbinding Recommendations 
 
 
GMPs FOR MEDICATED FEED MANUFACTURERS NOT REQUIRED 
TO REGISTER AND BE LICENSED WITH FDA 
This guidance represents the Food and Drug Administration's (FDA's) current thinking on this topic.  It does 
not create or confer any rights for or on any person and does not operate to bind FDA or the public.  You can 
use an alternative approach if the approach satisfies the requirements of the applicable statutes and 
regulations.  If you want to discuss an alternative approach, contact the FDA staff responsible for 
implementing this guidance.  If you cannot identify the appropriate FDA staff, call the appropriate number 
listed on the title page of this guidance. 
 
FOREWORD 
A most important responsibility of an animal feed manufacturer is to assure that the feed 
produced--whether medicated or non-medicated--meets the intended specifications and is not 
adulterated. All feed mixing operations, regardless of size or drugs used, share this 
responsibility. Medicated feeds must be proper with respect to drug content to have their 
intended effect. Medicated and non-medicated feeds that are adulterated with undesired drugs 
may cause violative drug residues in meat, milk or eggs, or injury to consuming animals. 
Everyone associated with food animal agriculture must work to avoid these risks to the public 
and animal health, and the potential loss of consumer confidence in animal-derived food 
products. 
The Food and Drug Administration (FDA) established the Current Good Manufacturing Practice 
(CGMP) Regulations for Medicated Feeds through public rulemaking. The CGMPs provide 
guidance for medicated feed manufacturers to assure that their products meet the identity, 
strength and quality which they should possess with respect to their drug content. The 
regulations apply equally to all manufacturers of medicated feeds using the same drug sources. 
The regulations are divided into two sections. The first section applies to facilities utilizing drug 
sources which require licensing and registration with FDA. This section is more comprehensive 
and detailed than the second section. The second section applies to those facilities which are not 
required to be licensed and registered. Medicated feeds must be manufactured in accordance with 
the appropriate applicable section of the CGMP Regulations to comply with the law. 
This guide is designed to provide information and answer typical questions about the regulatory 
responsibilities of the manufacturers of medicated feeds who are not licensed and registered with 
FDA and, hence, are subject to the requirements of the less detailed CGMP Regulations. 
BASIC INFORMATION 
Q. Who must comply with "Current Good Manufacturing Practices?"  Contains Nonbinding Recommendations 
 
A. All manufacturers of medicated feed must follow CGMPs. Anyone producing an animal feed 
containing an animal drug is subject to this requirement. This includes large multi-plant 
manufacturers and single-plant manufacturers, as well as on-farm mixing operations. 
Q. What is the legal basis for requiring compliance with CGMPs? 
A. The Federal Food, Drug, and Cosmetic Act (the Act) Section 501 (a)(2)(B) states that a 
medicated feed containing an animal drug is adulterated if not produced in conformance with 
CGMPs. Adulterated feeds and manufacturers of adulterated feed are subject to regulatory 
action. 
Q. Does the term "medicated feed" mean only a complete feed, one that can be fed as the 
sole ration? 
A. The term "medicated feed" includes all medicated feed products intended to be a substantial 
source of nutrients in the diet of an animal. It includes products commonly referred to as 
supplements, concentrates, premix feeds, and base mixes. It is not limited to complete feeds 
intended to be the sole ration of the animal. 
Q. Where are the CGMPs described? 
A. Regulations describing CGMPs have been published by FDA in the Code of Federal 
Regulations (CFR), Part 225. There are two sections of these regulations--one for mills 
registered with FDA to use drug sources requiring approved medicated feed mill licenses, and 
one for mills using only drug sources which do not require such licenses and registration with 
FDA. This booklet addresses the non-registered, non-licensed mill CGMP regulations. 
Q. How does following the CGMPs benefit me as a manufacturer of medicated feed? 
A. Observance of CGMPs should result in medicated animal feeds that meet product 
specifications. This will help assure that meat, milk, and eggs produced with these feeds contain 
no violative drug residues. Non-compliance with the CGMPs carries the potential of medicated 
feed products which could cause harm to consuming animals or result in unsafe drug residues in 
the edible products from these animals. 
CGMP REGULATIONS AND COMMENTS 
The text of the CGMP regulations for non-registered, non-licensed mills, as printed in the CFR, 
is reproduced below. Each paragraph is followed with pertinent comments to aid in 
understanding the requirements and how to meet them. 
CURRENT GOOD MANUFACTURING PRACTICE FOR MEDICATED FEEDS 
Subpart F -- Facilities and Equipment 
  225.120 Buildings and grounds.   Contains Nonbinding Recommendations 
 
Buildings used for production of medicated feed shall provide adequate space for 
equipment, processing, and orderly receipt and storage of medicated feed. Areas shall 
include access for routine maintenance and cleaning of equipment. Buildings and 
grounds shall be constructed and maintained in a manner to minimize vermin and pest 
infestation. 
Comment: Buildings and grounds should be suitable for their use and facilitate the 
production of feeds that are proper in all respects. Construction, maintenance, and upkeep 
should provide protection from the elements and pests. The key elements are suitability 
and good housekeeping. 
  225.130 Equipment.  
Equipment shall be capable of producing a medicated feed of intended potency and 
purity, and shall be maintained in a reasonably clean and orderly manner. Scales and 
liquid metering devices shall be accurate and of suitable size, design, construction, 
precision, and accuracy for their intended purposes. All equipment shall be designed, 
constructed, installed, and maintained so as to facilitate inspection and use of cleanout 
procedure(s). 
Comment: Equipment must be suitable for its purpose. It must be of proper size and 
design for the function performed to have the inherent needed capability to produce good 
products. Good maintenance is equally important. The key elements are accuracy, 
capability, and good maintenance. 
  225.135 Work and storage areas.  
Work areas and equipment used for the production or storage of medicated feeds or 
components thereof shall not be used for, and shall be physically separated from, work 
areas and equipment used for the manufacture and storage of fertilizers, herbicides, 
insecticides, fungicides, rodenticides, and other pesticides unless such articles are 
approved for use in the manufacture of animal feeds. 
Comment: Contamination of feed with potentially toxic non-feed substances is to be 
avoided. Keep all potential contaminants out of feed production areas to preclude 
accidental contamination of feed. The key element is to prevent contamination. 
Subpart G -- Product Quality Assurance 
  225.142 Components.  
Adequate procedures shall be established and maintained for the identification, storage, 
and inventory control (receipt and use) of all Type A medicated articles and Type B 
medicated feeds intended for use in the manufacture of medicated feeds to aid in assuring 
the identity, strength, quality, and purity of these drug sources. Packaged Type A 
medicated articles and Type B medicated feeds shall be stored in designated areas in their  Contains Nonbinding Recommendations 
 
original closed containers. Bulk Type A medicated articles and bulk Type B medicated 
feeds shall be identified and stored in a manner such that their identity, strength, quality, 
and purity will be maintained. All Type A medicated articles and Type B medicated 
feeds shall be used in accordance with their labeled mixing directions. 
Comment: It is vital that the identity and quality of drug sources be maintained, and that 
the labeled instructions for their use are followed. The key elements are continuous drug 
identification and protection, written inventory control, and adherence to label 
instructions. 
  225.158 Laboratory assays.  
Where the results of laboratory assays of drug components, including assays by State 
feed control officials, indicate that the medicated feed is not in accord with the 
permissible limits specified in this chapter, investigations and corrective action shall be 
implemented immediately by the firm and such records shall be maintained on the 
premises for a period of 1 year. 
Comment: Any indication of a breakdown in controls or that a mistake may have 
occurred requires a quick check to determine if there is a problem. This must be followed 
with any needed corrective action. A written record of the investigation, conclusions, and 
actions taken is to be made and retained. The key elements are to react, correct, and 
record. 
  225.165 Equipment cleanout procedures.  
Adequate procedures shall be established and used for all equipment used in the 
production and distribution of medicated feeds to avoid unsafe contamination of 
medicated and non-medicated feeds. 
Comment: Production and control procedures should be established to prevent unsafe 
contamination of feeds by residual medicated feed material in production and distribution 
systems. The key element is prevent unsafe carryover. 
Subpart H -- Labeling 
  225.180 Labeling.  
Labels shall be received, handled, and stored in a manner that prevents label mix-ups and 
assures that the correct labels are used for the medicated feed. All deliveries of medicated 
feeds, whether bagged or in bulk, shall be adequately labeled to assure that the feed can 
be properly used. 
Comment: Controls over labels shall ensure that labels are correct and that the proper 
label is used on all feeds. Labels must identify the product, drug content and purpose, and 
how the medicated feed is to be used. The key element is correct labels on all feeds.  Contains Nonbinding Recommendations 
 
Subpart I -- Records 
  225.202 Formula, production, and distribution records.  
Records shall be maintained identifying the formulation, date of mixing, and if not for 
own use, date of shipment. The records shall be adequate to facilitate the recall of 
specific batches of medicated feed that have been distributed. Such records shall be 
retained on the premises for 1 year following the date of last distribution. 
Comment: Records and procedures, including labeling, must provide a meaningful 
history of product production and distribution. This will enable a specific product to be 
located and returned if this is necessary. The key elements are complete written records 
and recall capability. 
OPERATIVE TERMS 
Q. What drug products used in medicated feeds are covered by CGMPs? 
A. All animal feeds containing animal drugs (medications) are covered by CGMPs. 
Q. Are all animal feed drugs regulated the same with respect to CGMPs?  
A. No. The applicable CGMP Requirements are based on the categorization of the drug and the 
potency. All drugs are placed into one of two categories based on whether or not there is a 
withdrawal requirement at the lowest continuous feeding level and the potential for harmful 
effect from misuse of the drug. 
Q. What are the two categories of drugs? 
A. The two categories of drugs are known as "Category I" and "Category II." 
  Category I consists of those drugs for which no withdrawal period is required at the 
lowest continuous feeding level for any approved species. Category I drugs do not require an 
approved Medicated Feed Mill License for manufacturing of medicated feeds unless they are 
combined with a Category II drug source requiring a Medicated Feed Mill License. 
  Category II consists of drugs that either require a withdrawal period at the lowest feeding 
level in at least one species for which the drug is approved, or are regulated on a "no-residue" 
basis because of a carcinogenic concern. Higher potency sources (Type A products) of Category 
II drugs require a Medicated Feed Mill License to manufacture medicated feeds. Lower potency 
sources (Type B products) are subject to the same requirements as Category I drugs. 
Q. What are the medicated product types? 
A. There are three (3) medicated product types: Type A, Type B, and Type C. These terms 
replace "medicated premix, concentrate, supplement, and complete feed," which are no longer 
being used in FDA's regulations.   Contains Nonbinding Recommendations 
 
  The Type A product is considered a drug, and the Type B and C products are medicated 
feeds. A Type A medicated article is a product that consists of one or more new animal drugs 
intended for use in the manufacture of a medicated feed. It is the subject of an approved new 
animal drug application.  
  A Type B medicated feed is intended solely for the manufacture of other medicated feeds 
(Type B or Type C).  
  A Type C medicated feed is a complete feed for the animal, or is a feed that may be fed 
"top-dressed" or offered "free-choice" in conjunction with other animal feed. 
REGISTRATION 
Q. What feed manufacturing establishments must register with FDA? 
A. Any feed manufacturing establishment that uses one or more Type A sources of Category II 
drugs to manufacture medicated feeds must register with FDA as a medicated feed 
establishment. Registration is not required if drug use is limited to Category I drugs (all types) 
and Type B sources of Category II drugs--that is, no Medicated Feed Mill License is held. 
Q. Where can I find information on the procedures for registration if I desire to register 
and obtain a Medicated Feed Mill License?  
A. Procedures for registration can be obtained from a local FDA office or you can write to the 
Drug Listing Branch (HFD-334), Center for Drug Evaluation and Research, Food and Drug 
Administration, 5600 Fishers Lane, Rockville, Maryland 20857. 
Q. What about producers who mix their own feed?  
A. All manufacturers of medicated feeds are subject to the same rules. If firms (commercial 
mills, feedlots, producers, mobile mixers, etc.) use only Category I products and/or Category II 
Type B drug products, registration with FDA is not required. These manufacturers must comply 
with the medicated feed CGMPs in 21 CFR Parts 225.120 to 225.202 (the less detailed set of 
CGMPs). They are not subject to biennial inspection by FDA. 
If a firm uses one or more Category II Type A medicated articles as drug sources, it must register 
with FDA and comply with the medicated feed CGMPs in 21 CFR Parts 225.10 to 225.115 (the 
more detailed set of CGMPs). As a registered establishment, it is subject to inspection by FDA or 
FDA- commissioned State inspectors at least once every two years for compliance with these 
CGMPs. 
INSPECTIONS  
Q. When are feed manufacturers inspected? 
A. All registered feed manufacturers are subject to at least one inspection during each two-year 
period. This inspection requirement is waived for those manufacturers not required to register.  Contains Nonbinding Recommendations 
 
Q. Will my feed manufacturing operation be inspected if it is not required to be registered? 
A. There will be no routine FDA biennial inspection. The fact that a feed manufacturing 
operation is not registered, however, does not mean that it is totally exempt from Federal 
inspection. An FDA investigator or an FDA- commissioned State inspector may conduct an 
inspection to confirm registration status of the firm or to follow up on a report of a drug residue, 
or for other appropriate reasons. Also, your State feed control office may conduct routine 
inspections to determine compliance of your facility with the less detailed CGMPs. 
Q. How can I, as a non-registered feed manufacturer, avoid problems? 
A. By knowing the CGMP regulations and by self-inspecting your own establishment, you can 
determine if your operation complies with the spirit and intent of the regulations. Non-
compliance may result in product adulteration and unacceptable risks to animal and/or public 
health. Ensure that all employees involved in the manufacture of medicated feeds have an 
understanding of the manufacturing and control operation(s) which they perform, including the 
location and proper use of equipment, and that all necessary procedures and controls are in place 
and followed. 
Q. What should I look for when I inspect my own feed manufacturing operation?  
A. Self-inspections of non-registered feed manufacturers should cover at least the following 
areas: 
A. Facilities and Equipment  
  225.120 Buildings and grounds: Is there adequate space for equipment, and 
processing and storage of medicated feeds? Does construction and maintenance 
minimize vermin and pest infestation?  
  225.130 Equipment: Is equipment capable of producing a medicated feed of intended 
potency and integrity? Are adequate cleanout procedures used to avoid unsafe 
contamination of medicated and non-medicated feeds? Such procedures may include 
physical cleanout, flushing, sequencing of production, and similar actions. Are scales 
and metering devices accurate and suitable for their intended purposes?  
  225.135 Work and Storage Areas: Are work areas, drug storage, and equipment free 
of pesticides, fertilizers and other toxic substances that could contaminate feeds?  
B. Product Quality Assurance  
  225.142 Components: Have adequate procedures been established and maintained for 
the identification, storage and inventory control of all drug sources intended for use in 
the manufacturing of medicated feeds? Are the procedures and records adequate to 
permit detection of incorrect use?  
  225.158 Laboratory Assays: Have necessary corrective actions been determined and 
taken when laboratory assays of drug components indicated a medicated feed was not 
within permissible limits? Are these records kept for at least one year?   Contains Nonbinding Recommendations 
 
  225.165 Equipment Cleanout Procedures: Have adequate procedures been 
established to prevent unsafe contamination of feeds? Are they followed?  
C. Labeling  
  225.180 Labeling: Are labels received, handled and stored in a manner that ensures 
correct labeling and prevents mix-ups? Are all medicated feeds adequately labeled?  
D. Records  
  225.202 Records: Are written records kept containing the formula, date of mixing, 
and date of shipment (if not for own use)? Can you locate and recall product if this is 
necessary?  
ENFORCEMENT 
Q. What will happen if my operation fails a CGMP inspection? 
A. The objective of FDA regulatory programs is to encourage and assure medicated feeds are 
properly manufactured and labeled. Enforcement activities include actions to correct and prevent 
violations, remove violative products or goods from the market, and punish offenders. 
Enforcement efforts range from a letter notifying the individual or firm of a violation and 
requesting correction, to seizure of product, to criminal prosecution of the individual or firm. The 
type of action recommended for failure to follow CGMPs will depend upon the nature of the 
violation and the public health concern, FDA policy, previous history of violations by the firm, 
and other factors. Your State may have a similar range of enforcement efforts under its authority. 
OTHER INFORMATION 
Q. Does the FDA have other information available for use by the medicated feed manufacturer? 
A. Yes. The following documents offer additional information about FDA and your 
responsibility as a feed manufacturer. These materials are free and available upon request from 
the Center for Veterinary Medicine, Communications Staff, HFV-12, 7519 Standish Place, 
Rockville, Maryland 20855. Some of these materials are available on CVM's Internet Web Site 
at http://www.fda.gov/AnimalVeterinary/default.htm. 
1.  FDA Compliance Program 7371.004 -- Medicated Feeds (FY 94 - 98)  
2.  Code of Federal Regulations, Part 225, Current Good Manufacturing Practice 
Regulations for Medicated Feeds  
3.  Code of Federal Regulations, Part 558, New Animal Drugs for Use in Animal Feeds.  
4.  Guidance Document #68 -- Small Entities Compliance Guide for Protein Blenders, Feed 
Manufacturers, and Distributors