Drug formulation design is used to develop a drug delivery system (DDS) suitable for the administration of therapeutics while maintaining their concentration within the therapeutic range for the desired duration to achieve a therapeutic effect. It is important to thoroughly understand the required chemical, interfacial, mechanical, and biological properties of the formulation before selecting a suitable biomaterial for drug delivery purposes. This chapter illustrates the properties of DDSs required for various routes of drug administration with a specific focus on targeting drugs to the brain, colon, and cancer tissues. Learn More