physical chemistry drug delivery system 5 Humans 4 Article 3 Drug Delivery Systems 3 drug formulation 3 drug release 3 human 3 nonhuman 3 unclassified drug 3 Administration, Oral 2 Animals 2 Antineoplastic Agents 2 Chemistry, Pharmaceutical 2 Drug products 2 Review 2 antineoplastic agent 2 cancer radiotherapy 2 chitosan nanoparticle 2 chloramphenicol 2 controlled study 2 cross linking 2 drug absorption 2 drug bioavailability 2 drug efficacy 2 hydrophobicity 2 in vivo study 2 lactose 2 oral drug delivery 2 pH 2