MCC Beyond-Use Dating and Stability 3

Question 1

Why is pH a critical factor in the stability of compounded preparations?

Accepted Answer

Specific pH ranges minimize degradation pathways such as hydrolysis and optimize drug stability

Answer

pH affects only the taste of oral formulations

Answer

pH only matters for injectable sterile preparations

Answer

pH has no measurable effect on BUD assignment

Question 2

Which of the following is a classic sign of physical instability in a compounded emulsion?

Accepted Answer

Phase separation or creaming

Answer

Change in pH value

Answer

Discoloration of the active ingredient only

Answer

Decrease in osmolarity

Question 3

What is the primary role of an antioxidant excipient in a compounded preparation?

Accepted Answer

To prevent or slow the oxidative degradation of drug molecules

Answer

To prevent microbial growth in aqueous formulations

Answer

To enhance the bioavailability of the active drug

Answer

To adjust and buffer the pH of the preparation

Question 4

Which container type is required for storage of photosensitive compounded preparations to prevent light-induced degradation?

Accepted Answer

Amber or opaque containers that block UV and visible light

Answer

Clear borosilicate glass containers for easy visual monitoring

Answer

Standard white high-density polyethylene containers

Answer

Any sealed container regardless of light transmission

Question 5

A patient is instructed to store an aqueous compounded preparation under refrigeration with a 14-day BUD. If the patient stores it at room temperature instead, what is the pharmacist's primary concern?

Accepted Answer

Accelerated microbial growth and chemical degradation may render it unsafe before the labeled BUD

Answer

The preparation will become too viscous to administer

Answer

The pH will self-correct to a safer range at room temperature

Answer

The BUD automatically extends when stored at room temperature

Question 6

Which USP chapter specifically establishes beyond-use dating categories and requirements for sterile compounded preparations?

Accepted Answer

USP <797>

Answer

USP <795>

Answer

USP <800>

Answer

USP <1151>

Question 7

Which of the following compounded preparation types would typically receive the shortest beyond-use date under USP guidelines?

Accepted Answer

An aqueous oral solution compounded from a manufactured drug product stored at room temperature

Answer

An anhydrous topical ointment compounded from bulk chemicals

Answer

A nonaqueous oral capsule compounded from USP-grade bulk powder

Answer

A freeze-dried powder for reconstitution stored at 2–8°C