Guidance for Industry
Immediate Release Solid Oral
Dosage Forms
Scale-Up and Postapproval
Changes: Chemistry,
Manufacturing, and Controls, In
Vitro Dissolution Testing, and
In Vivo Bioequivalence
Documentation Center for Drug Evaluation and Research (CDER)
November 1995
CMC 5 TABLE OF CONTENTS
I. PURPOSE OF GUIDANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
II. DEFINITION OF TERMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
III. COMPONENTS AND COMPOSITION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IV. SITE CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
V. CHANGES IN BATCH SIZE (SCALE-UP/SCALE-DOWN) . . . . . . . . . . . . . . 16
VI. MANUFACTURING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
VII. IN VITRO DISSOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
VIII. IN VIVO BIOEQUIVALENCE STUDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
IX. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
APPENDIX A:  NARROW THERAPEUTIC RANGE DRUGS  . . . . . . . . . . . . . . .  A-1  GUIDANCE FOR INDUSTRY 1
IMMEDIATE RELEASE SOLID ORAL DOSAGE FORMS
SCALE-UP AND POSTAPPROVAL CHANGES:
CHEMISTRY, MANUFACTURING, AND CONTROLS,
IN VITRO DISSOLUTION TESTING,
AND IN VIVO BIOEQUIVALENCE DOCUMENTATION
I. PURPOSE OF GUIDANCE
This guidance provides recommendations to sponsors of new drug applications
(NDA's), abbreviated new drug applications (ANDA's), and abbreviated
antibiotic applications (AADA's) who intend, during the postapproval period, to
change:  1) the components or composition; 2) the site of manufacture; 3) the
scale-up/scale-down of manufacture; and/or 4) the manufacturing (process and
equipment) of an immediate release oral formulation.  
This guidance is the result of:  1) a workshop on the scale-up of immediate
release drug products conducted by the American Association of
Pharmaceutical Scientists in conjunction with the United States Pharmacopoeial
Convention and the Food and Drug Administration (FDA); 2) research
conducted by the University of Maryland at Baltimore on the chemistry,
manufacturing and controls of immediate release drug products under the
FDA/University of Maryland Manufacturing Research Contract; 3) the drug
categorization research conducted at the University of Michigan and the
University of Uppsala on the permeability of drug substances; and 4) the Scale-
     1This guidance has been prepared by the Immediate Release Scale-up and Post
Approval Change (SUPAC) Expert Working Group of the Chemistry Manufacturing
Controls Coordinating Committee (CMC CC) of the Center for Drug Evaluation and
Research at the Food and Drug Administration.  This guidance is an informal
communication under 21 CFR 10.90(b)(9) that reflects the best judgment of CDER
employees at this time.  It does not create or confer any rights, privileges or benefits for
or on any person, nor does it operate to bind or obligate FDA in any way. For additional
copies of this guidance contact the Consumer Affairs Branch (formerly the Executive
Secretariat Staff), HFD-8, Center for Drug Evaluation and Research, 7500 Standish
Place, Rockville, MD 20855 (Phone: 301-594-1012). An electronic version of this
guidance is also available via Internet by connecting to the CDER file transfer protocol
(FTP) server (CDVS2.CDER.FDA.GOV). Up and Post Approval Changes (SUPAC) Task Force which was established by
the Center for Drug Evaluation and Research (CDER) Chemistry, Manufacturing
and Controls Coordinating Committee to develop guidance on scale-up and
other postapproval changes.  
The guidance defines:  1) levels of change; 2) recommended chemistry,
manufacturing, and controls tests for each level of change; 3)  in vitro dissolution
tests and/or in vivo bioequivalence tests for each level of change; and 4)
documentation that should support the change.  For those changes filed in a
changes being effected supplement [21 CFR 314.70(c)], the FDA may, after a
review of the supplemental information, decide that the changes are not
approvable.  This guidance thus sets forth application information that should be
provided to CDER to assure continuing product quality and performance
characteristics of an immediate release solid oral dose formulation for specified
postapproval changes.  This guidance does not comment on or otherwise affect
compliance/inspection documentation that has been defined by CDERs Office
of Compliance or FDAs Office of Regulatory Affairs.  This guidance does not
affect any postapproval changes other than the ones specified.  For changes
not addressed in this guidance, or for multiple changes submitted at one time or
over a short period of time, or where the number of batches needed for stability
testing is not specified, sponsors should contact the appropriate CDER review
division or consult other CDER guidances/guidelines to obtain information about
tests and application documentation.
21 CFR 314.70(a) provides that applicants may make changes to an approved
application in accordance with a guideline, notice, or regulation published in the
FEDERAL REGISTER that provides for a less burdensome notification of the
change (for example, by notification at the time a supplement is submitted or in
the next annual report).  This guidance permits less burdensome notice of
certain postapproval changes within the meaning of  314.70(a).
For postapproval changes for immediate release dosage forms that affect
components and composition, scale-up, site change, and manufacturing
process or equipment changes, this guidance supersedes the recommendations
in section 4.G of the Office of Generic Drugs Policy and Procedure Guide 22-90
(September 11, 1990).  For all other dosage forms and changes, this guidance
does not affect the recommendations in Guide 22-90.
II. DEFINITION OF TERMS 2
     2See Workshop Report:  Scale-up of Immediate Release Oral Solid Dosage Forms,
Pharmaceutical Research, 10 (2): 313-316, Skelly et al; and  Federal Register.  Vol. 59,
No. 183, Thursday, September 22, 1994, pages 48754-59.
2   
A. Batch
A specific quantity of a drug or other material produced according to a
single manufacturing order during the same cycle of manufacture and
intended to have uniform character and quality, within specified limits [21
CFR 210.3(b)(2)].
B. Contiguous Campus
Continuous or unbroken site or a set of buildings in adjacent city blocks.
C. Dissolution Testing
Case A: Dissolution of Q = 85% in 15 minutes in 900 milliliters (mL)
of 0.1N hydrochloride (HCl), using the United States
Pharmacopeia (USP) <711> Apparatus 1 at 100 revolutions
per minute (rpm) or Apparatus 2 at 50 rpm.
Case B: Multi-point dissolution profile in the application/compendial
medium at 15, 30, 45, 60, and 120 minutes or until an
asymptote is reached for the proposed and currently
accepted formulation.
Case C: Multi-point dissolution profiles performed in water, 0.1 N HCl,
and USP buffer media at pH 4.5, 6.5, and 7.5 (five separate
profiles) for the proposed and currently accepted
formulations.  Adequate sampling should be performed at
15, 30, 45, 60, and 120 minutes until either 90% of drug
from the drug product is dissolved or an asymptote is
reached.  A surfactant may be used with appropriate
justification. 
3 D. Drug Product
A drug product is a finished dosage form (e.g., tablet, capsule, or
solution) that contains a drug substance, generally, but not necessarily, in
association with one or more other ingredients [21 CFR 314.3(b)].  A solid
oral dosage form includes tablets, chewable tablets, capsules, and soft
gelatin capsules.
E. Drug Substance
An active ingredient that is intended to furnish pharmacological activity or
other direct effect in the diagnosis, cure, mitigation, treatment, or
prevention of a disease, or to affect the structure of any function of the
human body, but does not include intermediates used in the synthesis of
such ingredient [21 CFR 314.3(b)].
F. Equipment
Automated or non-automated, mechanical or non-mechanical equipment
used to produce the drug product, including equipment used to package
the drug product.
G. Formulation
A listing of the ingredients and composition of the dosage form.  
H. Justification
Reports containing scientific data and expert professional judgment to
substantiate decisions.
I. New Drug Substance
Any substance that, when used in the manufacture, processing, or
packing of a drug, causes that drug to be a new drug, but does not
include intermediates used in the synthesis of such substance [21 CFR
310.3(g)].
J. Operating Principle
Rules or concepts governing the operation of the system.
4 K. Pilot Scale
The manufacture of either drug substance or drug product by a procedure
fully representative of and simulating that used for full manufacturing
scale. 
For solid oral dosage forms this is generally taken to be, at a minimum,
one-tenth that of full production, or 100,000 tablets or capsules,
whichever is larger (see the FEDERAL REGISTER of Thursday,
September 22, 1994, 59 FR 48754-59).
L. Process
A series of operations and/or actions used to produce a desired result.
M. Ranges
The extent to which or the limits between which acceptable variation
exists. 
N. Same
Agreeing in kind, amount; unchanged in character or condition. 
O. Scale-up
The process of increasing the batch size.
P. Scale-down
The process of decreasing the batch size.
Q. Similar
Having a general likeness.
R. Significant body of information
A significant body of information on the stability of the drug product is
likely to exist after five years of commercial experience for new molecular
entities, or three years of commercial experience for new dosage forms. 
5 S. Validation
Establishing through documented evidence a high degree of assurance
that a specific process will consistently produce a product that meets its
predetermined specifications and quality attributes.  A validated
manufacturing process is one that has been proven to do what it purports
or is represented to do. The proof of validation is obtained through
collection and evaluation of data, preferably beginning from the process
development phase and continuing through the production phase.
Validation necessarily includes process qualification (the qualification of
materials, equipment, systems, buildings, and personnel), but it also
includes the control of the entire processes for repeated batches or runs . 
III. COMPONENTS AND COMPOSITION 
This section of the guidance focuses on changes in excipients in the drug
product.  Changes in the amount of drug substance are not addressed by this
guidance.  Changes in components or composition that have the effect of
adding a new excipient or deleting an excipient are defined at Level 3 (defined
below), except as described below.
A. Level 1 Changes
1. Definition of Level
Level 1 changes are those that are unlikely to have any detectable
impact on formulation quality and performance.
Examples:
a. Deletion or partial deletion of an ingredient intended to affect
the color or flavor of the drug product; or change in the
ingredient of the printing ink to another approved ingredient.
b. Changes in excipients, expressed as percentage (w/w) of
total formulation, less than or equal to the following percent
ranges:
6 EXCIPIENT PERCENT EXCIPIENT
(w/w) OUT OF TOTAL
TARGET DOSAGE
FORM WEIGHT
Filler 5
Disintegrant
Starch 3
Other 1
Binder 0.5
Lubricant
Calcium (Ca) or
Magnesium (Mg) Stearate 0.25
Other 1
Glidant
Talc 1
Other 0.1
Film Coat 1
These percentages are based on the assumption that the drug
substance in the product is formulated to 100% of label/potency. 
The total additive effect of all excipient changes should not be
more than 5%.  (Example:  In a product consisting of active
ingredient A, lactose, microcrystalline cellulose and magnesium
stearate, the lactose and microcrystalline cellulose should not vary
by more than an absolute total of 5% (e.g. lactose increases 2.5%
and microcrystalline cellulose decreases by 2.5%) relative to the
target dosage form weight if it is to stay within the Level 1 range). 
7 The components (active and excipients) in the formulation should
have numerical targets which represent the nominal composition of
the drug product on which any future changes in the composition
of the product are to be based.  Allowable changes in the
composition should be based on the approved target composition
and not on previous Level 1 changes in the composition.
2. Test Documentation
a. Chemistry Documentation
Application/compendial release requirements and stability
testing.
Stability testing:  one batch on long-term stability data
reported in annual report.
b. Dissolution Documentation
None beyond application/compendial requirements.
c. In Vivo Bioequivalence Documentation
None.
3. Filing Documentation
Annual report (all information including long-term stability data).
B. Level 2 Changes
1.  Definition of Level
Level 2 changes are those that could have a significant impact on
formulation quality and performance.  Tests and filing
documentation for a Level 2 change vary depending on three
factors:  therapeutic range, solubility, and permeability.
Therapeutic range is defined as either narrow or non-narrow.  A list
of narrow therapeutic range drugs is provided in Appendix A.  Drug
solubility and drug permeability are defined as either low or high. 
Solubility is calculated based on the minimum concentration of
drug, milligram/milliliter (mg/mL), in the largest dosage strength,
determined in the physiological pH range (pH 1 to 8) and
8 temperature (37 + 0.5oC).  High solubility drugs are those with a
dose/solubility volume of less than or equal to 250 mL.  (Example: 
Compound A has as its lowest solubility at 37  + 0.5oC, 1.0 mg/mL
at pH 7, and is available in 100 mg, 200 mg and 400 mg strengths. 
This drug would be considered a low solubility drug as its
dose/solubility volume is greater than 250 mL (400 mg/1.0
mg/mL=400 mL).  Permeability (P , centimeter per second) is
e
defined as the effective human jejunal wall permeability of a drug
and includes an apparent resistance to mass transport to the
intestinal membrane.  High permeability drugs are generally those
with an extent of absorption greater than 90% in the absence of
documented instability in the gastrointestinal tract, or those whose
permeability attributes have been determined experimentally).  
Examples:
a.  Change in the technical grade of an excipient.  (Example:
Avicel PH102 vs. Avicel PH200.)
b. Changes in excipients, expressed as percent (w/w) of total
formulation, greater than those listed above for a Level 1
change but less than or equal to the following percent
ranges (which represent a two fold increase over Level 1
changes):
EXCIPIENT PERCENT EXCIPIENT (w/w)
OUT OF TOTAL TARGET
DOSAGE FORM WEIGHT
Filler 10
Disintegrant
Starch 6
Other 2
9 Binder 1
Lubricant
Ca or Mg Stearate 0.5
Other 2
Glidant
Talc 2
Other 0.2
Film Coat 2
These percentages are based on the assumption that the drug
substance in the drug product is formulated to 100% of
label/potency.  The total additive effect of all excipient changes
should not change by more than 10%. 
The components (active and excipients) in the formulation should
have numerical targets that represent the nominal composition of
the product on which any future changes in the composition of the
product are to be based.  Allowable changes in the composition
should be based on the approved target composition and not on
the composition based on previous Level 1 or Level 2 changes.
2. Test Documentation
a. Chemistry Documentation
Application/compendial release requirements and batch
records.
Stability testing:  1 batch with 3 months accelerated stability
data in supplement and 1 batch on long-term stability. 
b. Dissolution Documentation
Case A: High Permeability, High Solubility Drugs
10 Dissolution of 85% in 15 minutes in 900 mL of
0.1N HCl.  If a drug product fails to meet this
criterion, the applicant should perform the
tests described for Case B or C (below).
Case B:  Low Permeability, High Solubility Drugs
Multi-point dissolution profile should be
performed in the application/compendial
medium at 15, 30, 45, 60 and 120 minutes or
until an asymptote is reached. The dissolution
profile of the proposed and currently used
product formulations should be similar.
Case C: High Permeability, Low Solubility Drugs
 
Multi-point dissolution profiles should be
performed in water, 0.1 N HCl, and USP buffer
media at pH 4.5, 6.5, and 7.5 (five separate
profiles) for the proposed and currently
accepted formulations.  Adequate sampling
should be performed at 15, 30, 45, 60, and
120 minutes until either 90% of drug from the
drug product is dissolved or an asymptote is
reached.  A surfactant may be used, but only
with appropriate justification. The dissolution
profile of the proposed and currently used
product formulations should be similar.
c. In Vivo Bioequivalence Documentation
None:  if the situation does not meet the description in 
Case A, Case B or Case C, refer to Level 3 changes.
3. Filing Documentation
Prior approval supplement (all information including accelerated
stability data); annual report (long-term stability data).
11 C. Level 3 Changes
1. Definition of Level
Level 3 changes are those that are likely to have a significant
impact on formulation quality and performance.  Tests and filing
documentation vary depending on the following three factors: 
therapeutic range, solubility, and permeability. 
Examples: 
a. Any qualitative and quantitative excipient changes to a
narrow therapeutic drug beyond the ranges noted in Section
III.A.1.b.
b. All other drugs not meeting the dissolution criteria under
Section III.B.2.b.
c. Changes in the excipient ranges of low solubility, low
permeability drugs beyond those listed in Section III.A.1.b.
d. Changes in the excipient ranges of all drugs beyond those
listed in Section III.B.1.b.
2. Test Documentation
a. Chemistry Documentation
Application/compendial release requirements and batch
records.
  Significant body of information available:
One batch with three months accelerated
stability data reported in supplement; one
batch on long-term stability data reported in
annual report.
Significant body of information not available:
Up to three batches with three months
accelerated stability data reported in
12 supplement; one batch on long-term stability
data reported in annual report.
b. Dissolution Documentation
Case B dissolution profile as described in Section III.B.2.b.
c. In Vivo Bioequivalence Documentation
Full bioequivalence study. The bioequivalence study may be
waived with an acceptable in vivo/in vitro correlation has
been verified.
3. Filing Documentation
Prior approval supplement (all information including accelerated
stability data); annual report (long-term stability data).
IV. SITE CHANGES
Site changes consist of changes in location of the site of manufacture for both
company-owned and contract manufacturing facilities and do not include any
scale-up changes, changes in manufacturing (including process and/or
equipment), or changes in components or composition. Scale-up is addressed in
Section V of this guidance.  New manufacturing locations should have a
satisfactory current Good Manufacturing Practice (CGMP) inspection.
A. Level 1 Changes
1. Definition of Level
Level 1 changes consist of site changes within a single facility
where the same equipment, standard operating procedures
(SOP's), environmental conditions (e.g., temperature and humidity)
and controls, and personnel common to both manufacturing sites
are used, and where no changes are made
13 to the manufacturing batch records, except for administrative
information and the location of the facility.  Common is defined as
employees already working on the campus who have suitable
experience with the manufacturing process.
2. Test Documentation
a. Chemistry Documentation
None beyond application/compendial release requirements.
b. Dissolution Documentation
None beyond application/compendial release requirements.
c. In Vivo Bioequivalence Documentation
None.
3. Filing Documentation
Annual report.
B. Level 2 Changes
1. Definition of Level
Level 2 changes consist of site changes within a contiguous
campus, or between facilities in adjacent city blocks, where the
same equipment, SOP's, environmental conditions (e.g.,
temperature and humidity) and controls, and personnel common to
both manufacturing sites are used, and where no changes are
made to the manufacturing batch records, except for administrative
information and the location of the facility. 
2. Test Documentation
a. Chemistry Documentation
Location of new site and updated batch records.  None
beyond application/compendial release requirements.
14 One batch on long-term stability data reported in annual
report.
b. Dissolution Documentation
None beyond application/compendial release requirements.
c. In Vivo Bioequivalence Documentation
None.
3. Filing Documentation
Changes being effected supplement; annual report (long-
term stability test data).
C. Level 3 Changes
1. Definition of Level
Level 3 changes consist of a change in manufacturing site to a
different campus.  A different campus is defined as one that is not
on the same original contiguous site or where the facilities are not
in adjacent city blocks.  To qualify as a Level 3 change, the same
equipment, SOP's, environmental conditions, and controls should
be used in the manufacturing process at the new site, and no
changes may be made to the manufacturing batch records except
for administrative information, location and language translation,
where needed. 
2. Test Documentation
a. Chemistry Documentation
Location of new site and updated batch records. 
 Application/compendial release requirements.
15 Stability:
Significant body of data available:
One batch with three months accelerated
stability data reported in supplement; one
batch on long-term stability data reported in
annual report.
Significant body of data not available:
Up to three batches with three months
accelerated stability data reported in
supplement; up to three batches on long- term
stability data reported in annual report.
b. Dissolution Documentation
Case B: Multi-point dissolution profile should be
performed in the application/compendial
medium at 15, 30, 45, 60 and 120 minutes or
until an asymptote is reached. The dissolution
profile of the drug product at the current and
proposed site should be similar.
c. In Vivo Bioequivalence Documentation
None.
3. Filing Documentation
Changes being effected supplement; annual report (long-term
stability data).
V. CHANGES IN BATCH SIZE (SCALE-UP/SCALE-DOWN)
Postapproval changes in the size of a batch from the pivotal/pilot scale biobatch
material to larger or smaller production batches call for submission of additional
information in the application.  Scale-down below 100,000 dosage units is not
covered by this guidance.  All scale-up changes should be properly validated
and, where needed, inspected by appropriate agency personnel. 
A. Level 1 Changes
16 1. Definition of Level
Change in batch size, up to and including a factor of 10 times the
size of the pilot/biobatch, where: 1) the equipment used to produce
the test batch(es) is of the same design and operating principles;
2) the batch(es) is (are) manufactured in full compliance with
CGMP's; and 3) the same standard operating procedures (SOP's)
and controls, as well as the same formulation and manufacturing
procedures, are used on the test batch(es) and on the full-scale
production batch(es). 
2. Test Documentation
a. Chemistry Documentation
Application/compendial release requirements.  Notification
of change and submission of updated batch records in
annual report.
 
One batch on long-term stability reported in annual report.
b. Dissolution Documentation
None beyond application/compendial release requirements.
c. In Vivo Bioequivalence
None.
3. Filing Documentation
Annual report (long-term stability data).
B. Level 2 Changes
1. Definition of Level
Changes in batch size beyond a factor of ten times the size of the
pilot/biobatch, where:  1) the equipment used to produce the test
batch(es) is of the same design and operating principles; 2) the
batch(es) is (are) manufactured in full compliance with CGMP'S;
and 3) the same SOP's and controls as well as the same
17 formulation and manufacturing procedures are used on the test
batch(es) and on the full-scale production batch(es). 
2. Test Documentation
a. Chemistry Documentation
Application/compendial release requirements.  Notification
of change and submission of updated batch records. 
Stability testing:  One batch with three months accelerated
stability data and one batch on long-term stability. 
b. Dissolution Documentation
Case B testing.
c. In Vivo Bioequivalence
None.
3. Filing Documentation
Changes being effected supplement; annual report (long-term
stability data).
VI. MANUFACTURING
Manufacturing changes may affect both equipment used in the manufacturing
process and the process itself.
A.  Equipment
1. Level 1 Changes
a. Definition of Change
This category consists of:  1) change from non-automated
or non-mechanical equipment to automated or mechanical
equipment to move ingredients; and 2) change to alternative
equipment of the same design and operating principles of
the same or of a different capacity.
18 b. Test Documentation
i. Chemistry Documentation
Application/compendial release requirements.
Notification of change and submission of updated
batch records. 
Stability testing:  One batch on long-term stability. 
ii. Dissolution Documentation
None beyond application/compendial release
requirements.
iii. In Vivo Bioequivalence Documentation
None.
c. Filing Documentation
Annual report (long-term stability data).
2. Level 2 Changes
a. Definition of Level
Change in equipment to a different design and different
operating principles.
b. Test Documentation
i. Chemistry Documentation
Application/compendial release requirements.
Notification of change and submission of updated
batch records. 
19 Stability testing:
Significant body of data available:
One batch with three months
accelerated stability data reported in
supplement; one batch on long-term
stability data reported in annual report.
Significant body of data not available:
Up to three batches with three months
accelerated stability data reported in
supplement; up to three batches on
long-term stability data reported in
annual report.
ii. Dissolution Documentation
Case C dissolution profile.
iii. In Vivo Bioequivalence Documentation
None.
c. Filing Documentation
Prior approval supplement with justification for change;
annual report (long-term stability data).  
B.  Process
1. Level 1 Changes
a. Definition of Level
This category includes process changes including changes
such as mixing times and operating speeds within
application/validation ranges.
b. Test Documentation
20 i. Chemistry Documentation
None beyond application/compendial release
requirements.
ii. Dissolution Documentation
None beyond application/compendial release
requirements.
iii. In Vivo Bioequivalence Documentation
None.
c. Filing Documentation
Annual report.
2. Level 2 Changes
a. Definition of Level
This category includes process changes including changes
such as mixing times and operating speeds outside of
application/validation ranges.
b. Test Documentation
i. Chemistry Documentation
Application/compendial release requirements.
Notification of change and submission of updated
batch records. 
Stability testing:  One batch on long-term stability.
ii. Dissolution Documentation
Case B dissolution profile.
iii. In Vivo Bioequivalence Documentation
None.
21 c. Filing Documentation
Changes being effected supplement; annual report (long-
term stability data).
3. Level 3 Changes
a. Definition of Level
This category includes change in the type of process used
in the manufacture of the product, such as a change from
wet granulation to direct compression of dry powder.
b. Test Documentation
i. Chemistry Documentation
Application/compendial release requirements. 
Notification of change and submission of updated
batch records. 
Stability testing:
Significant body of data available:
One batch with three months
accelerated stability data reported in
supplement; one batch on long-term
stability data reported in annual report.
Significant body of data not available:
Up to three batches with three months
accelerated stability data reported in
supplement; up to three batches on
long-term stability data reported in
annual report.
ii. Dissolution Documentation
Case B dissolution.
iii. In Vivo Bioequivalence Documentation
22 In vivo bioequivalence study. The bioequivalence
study may be waived if a suitable  in vivo/in vitro
correlation has been verified.
c. Filing Documentation
Prior approval supplement with justification; annual report
(long-term stability data). 
VII. IN VITRO DISSOLUTION
See current United States Pharmacopeia/National Formulary, section <711>, for
general dissolution specifications. All profiles should be conducted on at least 12
individual dosage units.
Dissolution profiles may be compared using the following equation that defines a
similarity factor (f ):
2
                                                                          
     
f  = 50 LOG {[1+1/n  n  (R-T)2]-0.5 x 100}
  2 t=1 t t
                                                                        
where R  and T are the percent dissolved at each time point.  An f  value
t t 2
between 50 and 100 suggests the two dissolution profiles are similar.
VIII. IN VIVO BIOEQUIVALENCE STUDIES
Below is a general outline of an  in vivo bioequivalence study. It is intended as a
guide and the design of the actual study may vary depending on the drug and
dosage form.
A. Objective:  
To compare the rate and extent of absorption of the drug product for
which the manufacture has been changed, as defined in this guidance, to
the drug product manufactured prior to the change.
B. Design:  
The study design should be a single dose, two-treatment, two-period
crossover with adequate washout period between the two phases of the
study.  Equal numbers of subjects should be randomly assigned to each
of the two dosing sequences.
23 C. Selection of Subjects:  
The number of subjects enrolled in the bioequivalence study should be
determined statistically to account for the intrasubject variability and to
meet the current bioequivalence interval.
D. Procedure:  
Each subject should receive the following two treatments:
Treatment 1: Product manufactured with the proposed change.
Treatment 2: Product manufactured prior to the proposed change.
Following an overnight fast of at least 10 hours, subjects should receive
either Treatments 1 or 2 above with 240 mL water.  Food should not be
allowed until 4 hours after dosing.  Water may be allowed after the first
hour.  Subjects should be served standardized meals beginning at 4
hours during the study.
E. Restrictions:
Prior to and during each study phase, water may be allowed  ad libitum
except for 1 hour before and after drug administration.  The subject
should be served standardized meals and beverages at specified times.
No alcohol or xanthine- or caffeine-containing foods and beverages
should be consumed for 48 hours prior to each study period and until
after the last blood sample is collected.
F. Blood Sampling:
Blood samples should be collected in sufficient volume for analysis of
parent drug and active metabolite(s), if any. The sampling times should
be such that it should be able to capture the C  and T  during the
max max
absorption period. Sampling should be carried out for at least three
terminal elimination half-lives for both parent drug and active
metabolite(s). Whole blood, plasma or serum, whichever is appropriate
for the analytes, should be harvested promptly and samples should be
frozen at -20oC or -70oC to maintain sample stability. 
G. Analytical Method:
24 The assay methodology selected should ensure specificity, accuracy,
interday and intraday precision, linearity of standard curves, and
adequate sensitivity, recovery, and stability of the samples under the
storage and handling conditions associated with the analytical method.
H. Pharmacokinetic Analysis:
From the plasma drug concentration-time data, AUC , AUC , C ,
0-t 0-inf max
T , K  and t  should be estimated.
max el 1/2
I. Statistical Analysis:
Analysis of variance appropriate for a crossover design on the
pharmacokinetic parameters using the general linear models procedures
of SAS or an equivalent program should be performed, with examination
of period, sequence and treatment effects. The 90% confidence intervals
for the estimates of the difference between the test and reference least
squares means for the pharmacokinetic parameters (AUC , AUC ,
0-t 0-inf
Cmax) should be calculated, using the two one-sided t-test procedure.
IX. REFERENCES
A. Code of Federal Regulations 210.3(b)(2) and (10), 310.3(b) and (g), and
320.1(a) and (e).
B. FDA/University of Maryland Manufacturing Research Contract Summary.
C. Federal Register.  Vol. 59, No. 183, Thursday, September 22, 1994,
pages 48754-59.
D. Guideline for Industry: Stability Testing of New Drug Substances and
Products, U.S. Department of Health and Human Services, Food and
Drug Administration, September 1994.
E. Guideline for Submitting Documentation for the Manufacture of and
Controls for Drug Products, U.S. Department of Health and Human
Services, Food and Drug Administration, February 1987.
F. Policy and Procedure Guide #22-90:  Interim Policy on Exceptions to the
Batch-Size and Production Condition Requirements for Non-Antibiotic,
Solid, Oral-Dosage Form Drug Products Supporting Proposed ANDAs,
25 U.S. Department of Health and Human Services, Center for Drug
Evaluation and Research, Office of Generic Drugs, September 13, 1990.
G. Workshop Report: Scale up of Immediate Release Oral Solid Dosage
Forms, Pharmaceutical Research, 10 (2):  313-16, Skelly et al.
SUBMITTED BY:
_____________________________________
Allen Rudman
Chair, SUPAC Working Group
APPROVED BY:
______________________________________
Roger L. Williams,M.D.
Chair, CMC CC
26 Appendix A
Narrow Therapeutic Range Drugs
Aminophylline Tablets, ER Tablets
Carbamazepine Tablets, Oral Suspension
Clindamycin Hydrochloride Capsules
Clonidine Hydrochloride Tablets
Clonidine Transdermal Patches
Dyphylline Tablets
Disopyramide Phosphate Capsules, ER Capsules
Ethinyl Estradiol/Progestin Oral Contraceptive Tablets
Guanethidine Sulfate Tablets
Isoetharine Mesylate Inhalation Aerosol
Isoproterenol Sulfate Tablets
Lithium Carbonate Capsules, Tablets, ER Tablets
Metaproterenol Sulfate Tablets
Minoxidil Tablets
Oxtriphylline Tablets, DR Tablets, ER Tablets
Phenytoin, Sodium Capsules (Prompt or Extended), Oral Suspension
Prazosin Hydrochloride Capsules
Primidone Tablets, Oral Suspension
Procainamide Hydrochloride, Capsules, Tablets, ER Tablets
Quinidine Sulfate Capsules, Tablets, ER Tablets
Quinidine Gluconate Tablets, ER Tablets
Theophylline Capsules, ER Capsules, Tablets, ER Tablets
Valproic Acid Capsules, Syrup
Divalproex, Sodium DR Capsules, DR Tablets
Warfarin, Sodium Tablets
ER - Extended Release
DR - Delayed Release
A-1