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Highly Variable Drugs (HVD) and Highly Variable Drug Products (HVDP) are defined by their variability in pharmacokinetics, particularly when the ANOVA-CV exceeds 30%. This high variability necessitates larger sample sizes in traditional bioequivalence (ABE) studies, even with two samples. The distinction between HVD and HVDP is critical for regulatory considerations in drug development, affecting study design and approval processes. This guide provides an overview of the implications and requirements for testing these unique drug formulations.
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