Combination Drug Delivery Approach as an Effective Therapy for Various Diseases explores the use of bioengineering tools in combination drug delivery approaches to control various diseases at different clinical stages of synergistic action, varying mechanism of action and suppressing drug resistance. Treatment with a combination of drugs is thought to work by the first drug killing mutants resistant to the second drug, while the second drug kills those resistant to the first drug. Combined treatment has been remarkably successful in preventing the emergence of resistance during treatment of various diseases. This success has led to the introduction of multi-drug treatment for various diseases such as leprosy, HIV infections, and cancer. This book presents fundamental knowledge on the experiential and experimental aspects of drug combination approach in order to equip researchers' rational application in preventing the emergence of resistance during the treatment of various diseases for improving and extending the human life. Combination Drug Delivery Approach as an Effective Therapy for Various Diseases provides a holistic understanding of the principle behind formation, characterization, applications, regulations, toxicity, challenges and future perspectives of combination drug delivery approaches. It will be of interest to researchers and advanced graduate students in pharmaceutical science, chemistry, biology, and medicine as well as pharmaceutical companies and scientific organizations.