"Drug delivery is the method or process of administering a pharmaceutical compound to achieve a therapeutic effect in humans or animals. Drug delivery technologies are patent protected formulation technologies that modify drug release profile, absorption, distribution and elimination for the benefit of improving product efficacy and safety, as well as patient convenience and compliance. Most common routes of administration include the preferred non-invasive peroral (through the mouth), topical (skin), transmucosal (nasal, buccal/sublingual, vaginal, ocular and rectal) and inhalation routes. Many medications such as peptide and protein, antibody, vaccine and gene based drugs, in general may not be delivered using these routes because they might be susceptible to enzymatic degradation or can not be absorbed into the systemic circulation efficiently due to molecular size and charge issues to be therapeutically effective. For this reason many protein and peptide drugs have to be delivered by injection. For example, many immunizations are based on the delivery of protein drugs and are often done by injection."
(Wikipedia, Drug Release, 11/27/2010)

More and more polymeric materials are used as carrier to deliver and control the release of drugs.  (RDC 11/27/2010) 

Antibiotics
Applications   
Cancer Drugs  
Controlled Release   
Controlled Release of Agricultural Agents 
Dendrimer (Star Copolymer) Drug Delivery  
Drug Delivery Coatings  
Electrical Drug Delivery   
Gene Delivery  
Hydrogel Drug Delivery    
Interpenetrating Network Drug Release Systems 
Medicine   
Micelle Drug Delivery  
Nanoparticle Drug Delivery  
Polyurethane Drug Delivery  
Polylactic Acid (PLA) Drug Delivery  
Pysllium Drug Delivery  
Quantum Dot Drug Delivery

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