MCC Beyond-Use Dating and Stability 2 — Questions and Answers
Question 1: Which analytical method is considered the gold standard for assessing drug concentration and confirming potency during stability testing of compounded preparations?
- Visual inspection only
- High-performance liquid chromatography (HPLC) (Correct answer)
- pH measurement
- Osmolarity testing
Correct answer: High-performance liquid chromatography (HPLC)
HPLC is the gold standard analytical method for quantifying drug concentration and confirming potency in stability studies due to its sensitivity and specificity.
Question 2: According to USP <797> (2023), what is the maximum BUD for a Category 2 CSP stored at controlled room temperature WITHOUT extended stability studies?
- 12 hours
- 24 hours
- 4 days (Correct answer)
- 14 days
Correct answer: 4 days
Category 2 CSPs without extended stability studies may be assigned a BUD of up to 4 days at controlled room temperature per the 2023 revision of USP <797>.
Question 3: What does the term 'potency' refer to in the context of beyond-use dating for compounded preparations?
- The color and clarity of the preparation
- The amount of active drug per unit that produces a given pharmacological effect (Correct answer)
- The microbial bioburden of the preparation
- The viscosity of the compounded product
Correct answer: The amount of active drug per unit that produces a given pharmacological effect
Potency refers to the concentration of active ingredient per unit dose that produces the intended pharmacological effect; it must remain within acceptable limits throughout the BUD period.
Question 4: Which organization provides the primary national standards for beyond-use dating in both sterile and non-sterile compounded preparations in the United States?
- FDA only
- DEA only
- United States Pharmacopeia (USP) (Correct answer)
- Centers for Disease Control and Prevention (CDC)
Correct answer: United States Pharmacopeia (USP)
USP chapters <795> (non-sterile) and <797> (sterile) provide the primary national standards for BUD assignment and are widely adopted by state boards and accrediting bodies.
Question 5: A pharmacist compounds a water-containing oral suspension from bulk chemicals. Under USP <795> Category 1 guidelines, what is the maximum BUD?
- 14 days at room temperature
- 35 days under refrigeration (Correct answer)
- 90 days at room temperature
- 180 days under refrigeration
Correct answer: 35 days under refrigeration
Water-containing oral formulations compounded from bulk chemicals under USP <795> Category 1 have a maximum BUD of 35 days when stored under refrigeration.
Question 6: Which of the following best describes 'accelerated stability testing' for compounded preparations?
- Testing performed by exposing preparations to extreme conditions (e.g., elevated temperature/humidity) to predict long-term stability (Correct answer)
- Immediate post-compounding potency verification only
- Stability testing conducted exclusively at room temperature for 30 days
- Visual inspection of the preparation for color changes over 24 hours
Correct answer: Testing performed by exposing preparations to extreme conditions (e.g., elevated temperature/humidity) to predict long-term stability
Accelerated stability testing uses elevated temperature and humidity to simulate the effects of long-term storage in a shorter time, allowing faster prediction of appropriate BUDs.
Question 7: When peer-reviewed literature documents stability data for a specific compounded formulation, how should this data influence BUD assignment?
- Use the manufacturer's expiration date from any ingredient in place of literature data
- Apply only the standard USP default BUD and ignore literature data
- The BUD may be extended based on valid stability data, provided compounding conditions match those studied (Correct answer)
- Assign a BUD of 1 year for any preparation with any documented stability reference
Correct answer: The BUD may be extended based on valid stability data, provided compounding conditions match those studied
Valid peer-reviewed stability data can support BUDs beyond USP defaults, but the compounding conditions, formulation, and storage must match those described in the published study.
MCC Beyond-Use Dating and Stability 2
Which analytical method is considered the gold standard for assessing drug concentration and confirming potency during stability testing of compounded preparations?