Webwith high within-subject variability. In case of high variability, more regulatory authorities may accept a two-stage or group-sequential bioequivalence design using appropriately adjusted statistical analysis. This review also considers the mechanisms why drugs and drug products may exhibit large variability. The physiological complexity of ... WebMay 20, 2024 · Highly variable drugs are defined as drugs with intra-subject variability larger than 30% for a PK parameter. Trials aimed at proving conventional BE of PK parameters for highly variable drugs require many subjects.
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WebHowever, some such variability may be reduced via special and specific chemical handling of the test compounds. 52–54 Fourth, the microbial burden quantitation method (e.g. agar-based cfu/mL count versus time to positivity in liquid cultures) and processing procedures of samples will also contribute to technical variability. 55 The technical ... WebPlasma Concentration Profile . 3 . ln Concentration AUC Time . 100 1000 10000 0 5 10 15 20 25. C. max . Time Concentration T. max - time of maximum concentration chrysalean
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WebFeb 1, 2008 · If high variability exists due to drug substance pharmacokinetics, it may be necessary to use large numbers of subjects to achieve an acceptable bioequivalence study. WebMay 1, 2012 · Assays employed in HTS and lead optimization projects in drug discovery should be rigorously validated both for biological and pharmacological relevance, as well as for robustness of assay performance. This chapter addresses the essential statistical concepts and tools needed in assay performance validation developed in the … WebFor drugs that have high intrinsic variability, intra-individual variability can also factor into dose assessment. For example, tacrolimus exhibits variable bioavailability, multiple drug interactions, and unclear exposure–response correlations (such as the correlation between subtherapeutic concentrations and risk of organ rejection). chrysal extra flower freshness