Question

To rule out the probability of dose dumping from an oral CR dosage form, USP has included which sampling time point for in vitro dissolution test where D is normal dosing interval 

• A. 0.50D
• B. 0.25D
• C. 50-1.0D
• D. 1.0-2.0D

Answer 1

The Correct Option is B

To address the question about sampling time points included by the United States Pharmacopeia (USP) for in vitro dissolution tests to rule out the probability of dose dumping from an oral controlled release (CR) dosage form, we need to understand the concept of dose dumping and the purpose of in vitro dissolution testing.

Understanding Dose Dumping: Dose dumping refers to the rapid release of a drug from a controlled release dosage form, leading to a spike in drug concentration. This can cause toxicity and negate the advantages of sustained drug delivery.

In Vitro Dissolution Testing: This is an essential step in formulation development and quality control. It helps ensure consistent drug release profiles and can predict the in vivo performance of a dosage form.

The USP has suggested specific time points for dissolution testing to monitor the release pattern of the drug. For controlled release formulations, it's crucial to ensure that the drug is released gradually over the specified dosing interval. Sampling at different fractions of the dosing interval helps in assessing the performance of the CR formulation.

Among the given options, 0.25D (where D is the dosing interval) is the key sampling time point included by USP. This early sampling time point is critical as it allows for the detection of any initial rapid release (or dose dumping) from the dosage form.

Justification of the Correct Option:

• 0.25D: Captures the initial phase of drug release, crucial for detecting premature burst release or dose dumping.
• 0.50D: Represents a midpoint in the dosing interval, useful to measure sustained release, not specifically for dose dumping check at early phase.
• 1.0-2.0D: Usually, these time points are used to document complete release, which is not intended to monitor dose dumping, as it would have already manifested early in the interval.
• 50-1.0D: This is not a usual representation and likely represents a typo or confusing notation.

Hence, the correct answer is \(0.25D\). This time point is included for detecting any immediate release of the drug that could potentially lead to dose dumping.