This guidance is intended to assist sponsors and applicants of new drug applications (NDAs), biologics license applications (BLAs), abbreviated new drug applications (ANDAs), and investigational new drugs (IND) applications in the application of population pharmacokinetic (PK) analysis. Population PK analysis is frequently used to guide drug development and inform recommendations on therapeutic individualization (e.g., through tailored dosing) (Marshall et al. 2015; Lee et al. 2011; Bhattaram et al. 2005). Adequate population PK data collection and analyses submitted in marketing applications have in some cases alleviated the need for postmarketing requirements or postmarketing commitments.