What does bioequivalence (BE) require for Cmax and AUC in typical oral BE studies?

• A. BE means similar rate and extent of absorption; typically 90% confidence intervals for Cmax and AUC within 80–125% for test vs reference products, under specified study designs.
• B. BE means identical chemical structure
• C. BE means same color packaging
• D. BE means same label text

Answer: (A)

In bioequivalence testing, the goal is to show that two oral products have similar rate and extent of absorption, as reflected by Cmax and AUC. Cmax represents how fast the drug peaks in the blood (rate of absorption), while AUC represents the total amount of drug that reaches systemic circulation (extent of absorption). The standard regulatory criterion is that the 90% confidence interval for the ratio of the test product to the reference product, for both Cmax and AUC, falls within 80% to 125%. This comparison is typically done using log-transformed data and a crossover study design under specified conditions (like fasting or fed states). Meeting these criteria means the two products are considered bioequivalent in terms of how much and how quickly the drug becomes available in the body. Packaging color or labeling has no bearing on BE.