Dissolution Sampling Times for Generic and Reference Products
A) True - The dissolution sampling times for both generic and reference product profiles should be the same.
Rationale for Identical Sampling Times
When comparing dissolution profiles between generic (test) and reference products, using identical sampling time points is a fundamental requirement for valid comparative assessment 1. This standardization is essential because:
Statistical comparison methods require matched time points - The similarity factor f2, which is the primary metric recommended by both FDA and EMA for dissolution profile comparison, is calculated based on dissolution rates measured at the same time points for both products 1, 2.
Regulatory guidelines mandate consistent methodology - Both European and US pharmacopoeia dissolution methods emphasize standardized conditions, including identical sampling times, to ensure valid quality control comparisons 3.
Mathematical validity depends on paired data - All statistical approaches for dissolution profile comparison (including bootstrap methods, confidence interval derivation, Mahalanobis distance, and model-dependent approaches) require dissolution measurements at identical time points to calculate meaningful differences or similarities 1.
Practical Implementation
The comparison process requires:
Identical dissolution apparatus and conditions - Same paddle speed (typically 75 rpm), same volume of dissolution medium (typically 900 mL), and same temperature (37 ± 0.5°C) 4.
Synchronized sampling schedules - Common sampling time points such as 5,10,15,20, and 30 minutes for immediate-release products, with both test and reference products sampled at these exact intervals 4.
Consistent analytical methods - The same spectrophotometric or analytical technique applied at each time point for both products 5, 4.
Critical Considerations
Without identical sampling times, the fundamental basis for comparison is lost - The f2 similarity factor formula specifically requires dissolution percentages at matching time points, and any deviation from this requirement invalidates the comparison 6, 1. This is particularly important when dealing with products showing large variations in individual dissolution rates, where proper statistical assessment becomes even more critical 6.