presentation on-stability-study of pharmaceutical product
TRANSCRIPT
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Presentation on: stability study of pharmaceutical products
Presented To:
Department of Pharmacy
Northern university Bangladesh
Supervised by:
Dr. Harun AR Rashid
Associate professor & Head
Department of Pharmacy
Presented By:
Md.Mohsin &
Khadija Tut Tahera
NORTHERN UNIVERSITYB A N G L A D E S H
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Contents
stability
Stability study
Types of stability
Pharmaceutical degradation
Testing conditions
Climate zone
Guidelines
Types of stability testing
Activation energy
Shelf life prediction
Limitation of accelerated
study
Current trend in stability
testing
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Stability
.
Stability of pharmaceutical product may be defined as the capability of a particular formulation in a specific container/closure system to remain within its physical, chemical, microbiological, therapeutic and toxicological specification.
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Stability study
Stability testing/study is termed as a complex process because of involvement of a variety of
factors including
1
stability of the active ingredients
3
heat and moisture conditions
encountered during shipment,
storage and handling.
4
type of dosage form
5
interaction between active ingredients and
excipients
2
container/closure system used for packaging
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Need for stability study
Provide evidence as to how the quality of
the drug product varies with time.
Establish shelf life for the drug product.
Determine recommended
storage conditions
Determine container and closure system
suitability.
Safety point of view of patient.
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Ultimate achievement
Assurance to the patient
Economic considerations
Legal requirement
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THEARAPEUTICAL
STABILITY
PHYSICAL
STABILITY
TOXICOLOGIC
STABILITY
MICROBIOLOGICAL
STABILITY
CHEMICAL
STABILITY
Stability
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PHARMACEUTICAL DEGRADATION
1. Physical degradation
2. Chemical degradation
3.Microbiological degradation
TYPES OF PHARMACEUTICAL DEGRADATION
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FACTORS AFFECTING PHYSICAL DEGRADATION
PHYSICAL DEGRADATION
Polymorphic changes
Crystal growth
Absorption of H2O
Loss of H2O
Loss of volatile
components
Color changes
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chemical degradation
Hydrolysis oxidation Decarboxylation Isomerization Polymerization
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MICROBIAL DEGRADATION
MICROBIAL DEGRADATION
EndotoxinPyrogen
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What happens if drug is degraded?
Lowering of concentration/potency
Active to toxic product
appearance
Reduction in bioavailability
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TYPES OF STABILITY TESTING
stability testing
Real-Time stability testing
Accelerated stability testing
Retained sample/ongoing stability
testing
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GUIDELINES
guidelines
ICH
FDAWHO
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Climate zone
Four climatic zones can be distinguished for the purpose of worldwide stability testing, as follows: ICH Stability Zones
Zone Type of Climate
Zone I Temperate zone
Zone II Mediterranean/subtropical zone
Zone III Hot and dry zone
Zone IV Hot humid/tropical zone
Zone IVb ASEAN testing conditions hot/higher humidity
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Testing Conditions
Long Term/Real-Time stability testing
Climatic Zone Temperature Humidity Minimum Duration
Zone I 21ºC ± 2ºC 45% RH ± 5% RH 12 Months
Zone II 25ºC ± 2ºC 60% RH ± 5% RH 12 Months
Zone III 30ºC ± 2ºC 35% RH ± 5% RH 12 Months
Zone IV 30ºC ± 2ºC 65% RH ± 5% RH 12 Months
Zone IVb 30ºC ± 2ºC 75% RH ± 5% RH 12 Months
Refrigerated 5ºC ± 3ºC No Humidity 12 Months
Frozen -15ºC ± 5ºC No Humidity 12 Months
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Testing Conditions
Accelerated and Intermediate Testing Conditions
Climatic Zone Temperature Humidity Minimum Duration
Accelerated
Ambient
40ºC ± 2ºC 75% RH ± 5% RH 6 Months
Accelerated
Refrigerated
25ºC ± 2ºC 60% RH ± 5% RH 6 Months
Accelerated Frozen 5ºC ± 3ºC No Humidity 6 Months
Intermediate 30ºC ± 2ºC 65% RH ± 5% RH 6 Months
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Sampling Frequency
For Long term testing, during first year sampling should be done every three months, during second year, sampling should be done every six months and after two years, sampling should be done once a year.
Accelerated testing should be done at least six months and it suggests sampling points of 0, 3, 6 months.
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Testing parameters of different dosage forms
Tablets Capsules Oral solutions, suspensions and
emulsions
Topical & Ophthalmic and
Preparation
Powders and granules for oral solution or suspension
Metered-dose Inhalations and Nasal Aerosols
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Examples of testing parameters contd
Suppositories Freeze-dried Products
Transdermal Patches
large volume parenterals (LVPs)
Small volume parenterals (SVPs)
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ACCELERATED STABILITY TESTING AND ACTIVATION ENERGY
Activation energy is the energy that must be overcome in order for a chemical reaction to occur. Activation energy may also be defined as the minimum energy required to start a chemical reaction. The activation energy of a reaction is usually denoted by Ea.
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ARRHENIUS EQUATION
Reaction rates are proportional to the number of collisions per unit time (of reactant molecules). The number of collisions increases as the temperature increases. Therefore, the reaction rate increases as the temperature increases according to Arrhenius equation
K = A e-Ea/RT
logK = logA - (Ea/2.303RT)
K = reaction rate constant
A = frequency factor constant i.e maximum number of collisions at infinite temperature
Ea = Energy of activation
T = absolute temperature (Kelvin)
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Estimation of energy of activation
Fig. Arrhenius plot
A graph can be drawn by taking log k on y-axis and reciprocal temperature (1/T) on x-axis.
A straight line is obtained, the slope of the line is negative and the magnitude is Ea / 2.303 R.
The intercept corresponds to logA
All the constants in the Arrhenius equation can be obtained from the graph.
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Estimation of k value
The reaction is conducted at several temperatures.
Concentration of reactants is determined.
Appropriate graphs are drawn for the kinetic data.
Data is processed for all the orders.
The order of the reaction is identified and from the slopes of the lines, k values are calculated for all temperatures.
Arrhenius plot for elevated temperatures
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SHELF LIFE EXTENSION
To support a shelf life extension, a report must be generated documenting stability data (for the proposed interval) for three batches which meet all the following criteria:
Same product / potency
Same manufacturing
process.
Same primary packaging material
Same formulation
No significant change in the manufacturing procedure
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Re-stability test after registration
Once the pharmaceutical product has been registered, additional stability studies are required whenever variations that may affect the stability of
the active pharmaceutical substance or pharmaceutical product are made, such as major variations like the following:
a. Change in the manufacturing process.
b. Change in the composition of the
pharmaceutical product.
c. Change of the immediate packaging.
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PHOTOSTABILITY
Photo degradation may be observed as bleaching or as discoloration of products. The other effects include cloudy appearance of the product, a loss in viscosity of formulation, precipitation of active principle, alteration in dissolution rate, Although many drugs are found to decompose when exposed to light.
Light Source
Xenon lamps
Tungsten-mercury lamps
Natural Light
Artificial daylight tubes
By exposing drug substance to 400 & 900 (FC)of illumination for 4 & 2 weeks to light and another sample examined protected from light .
e.g. cycloprofen becomes very yellow after five days under 900 foot candles of light
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Limitation of Arrhenius relationship for stability prediction
Stability predictions based on Arrhenius equation are valid only when the break down depends on temperature
The energy of activation obtained in the study should be between 10 to 30 kcal/mole
When degradation is due to Microbial contamination or Photochemical reactions
When the product looses its physical integrity at higher temperatures
When the order changes at elevated temperatures
In case of disperse systems, when temperature is elevated viscosity is decreased and this may introduce errors in the prediction of stability
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STABILITY CHAMBER
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CURRENT TRENDS IN STABILITY TESTING
Current trend, especially amongst the multinational pharmaceutical companies, is to define conditions for stability testing for global marketing. For this the companies are orienting their protocols to single set of conditions that covers extreme environmental conditions. The specific changes for global testing include increase in duration of accelerated testing period from 6 to 12 months, and conduct of additional tests at 50°C/75% RH for 3 months.
The concept behind this change is to avoid repetition of stability testing for other regions and efficient and optimum use of resources as all tests are done in one laboratory. Moreover testing under combination of three environmental factors ; temperature, humidity and light, has been reported to result in stronger deleterious effect on drug substances and products, than under temperature and humidity conditions only.
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Reference
1.Stability testing for hot and humid climates, WHO Drug Information Vol 18,
2, 2004, page 113-156
2. World Health Organization :Stability Testing Of Active Pharmaceutical
Ingredients and Finished Pharmaceutical Products; WHO Technical Report
Series, No. 953, 2009 ; Page No.87-123.
3. ICH Q1A: “Stability Testing of New Drug Substances and Products”
http://www.ich.org/LOB/media/MEDIA419.pdf
4.ICH Q1C: “Stability Testing of New Dosage Forms”
http://www.ich.org/LOB/media/MEDIA413.pdf
5.ICH Q1E: “Evaluation for Stability Data”
http://www.ich.org/LOB/media/MEDIA415.pdf
http://www.ich.org/LOB/media/MEDIA427.pdf
http://www.ich.org/LOB/media/MEDIA430.pdf
6.Handbook of modern pharmaceutical analysis, Volume III, page: 445-483
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Reference 7. Ali J., Khar RK., Ahuja A. Dosage form and design.3rd ed. Delhi. Birla
Publications Pvt. Ltd ( 2008) 100-123
8.International Conference on Harmonization, guidelines Q1A and Q1F,
www.ich.org/
9.CVS Subrahmanyam, Textbook of Physical Pharmacy, Second Edition; 15
May 2000;Page No-51-58,366-426
10. Grimm W. Extension of the international conference on harmonization
tripartite guideline for stability testing of new drug substances and products
to countries of climatic zones 3 and 4. Drug Dev.Ind. Pharm. 1998; 24:313-
325
11.http://www.fda.gov/ICECI/Inspections/InspectionGuides/InspectionTechnical
Guides/ucm072919.htm
12. http://www.authorstream.com/Presentation/sachins_patil16-1564811-ich-
guidelines-stability-studies-accelerated/
13. http://apps.who.int/medicinedocs/en/d/Jh1808e/
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