Book excerpt: A reference is needed that addresses the recent progress in aspects of PK/PD methods and developments of nanoparticles for novel drug delivery systems. No other consolidated published reference discusses the PK/PD study of nanoparticle drug delivery systems. This book discusses the advantages of nanoparticle drug delivery systems (NPDDS) in enhancing the pharmacokinetics of many drugs that are not easily metabolized or that obtain the desired therapeutic effect with minimum toxicity. The authors provide an overview of biodistribution with a focus on polymer and lipid nanoparticles. This thorough reference is divided into three parts: Modelling, Specific carries and their potential to treat specific diseases.