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Stability Versus Potency Testing: The Madness is in the Method
Thomas C Kupiec1, Rodney Skinner, Lance Lanier
1Analytical Research Laboratories, Inc., Oklahoma City, Oklahoma.
Potency tests measure active drug amounts, while stability tests determine a preparation's beyond-use date. Understanding the difference is crucial for quality assurance in compounding pharmacy.
Area of Science:
- Pharmaceutical Sciences
- Compounding Pharmacy
- Quality Control
Background:
- Potency tests quantify the active drug concentration in a sample.
- Stability tests establish the beyond-use date for pharmaceutical preparations.
- Differentiating these tests is vital for ensuring compounded preparation quality.
Purpose of the Study:
- To clarify the distinct roles of potency and stability testing in pharmaceutical compounding.
- To emphasize the importance of using stability-indicating methods for accurate assessments.
- To highlight the integration of these tests into quality assurance programs.
Main Methods:
- Discussion of quantitative methods for potency determination.
- Explanation of stability-indicating methods for assessing drug shelf-life.
- Emphasis on the criteria for a method to be considered stability-indicating.
Main Results:
- Potency tests may not always be stability-indicating.
- Stability can only be accurately determined by a stability-indicating method.
- A stability-indicating method can assess both potency and stability.
Conclusions:
- Compounding pharmacists must understand the differences between potency and stability testing.
- Stability-indicating methods are essential for determining beyond-use dates.
- These tests should be integral components of quality assurance programs for compounded preparations.
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