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Drug delivery is the method or process of administering a pharmaceutical compound to achieve a desired therapeutic effect in humans or animals. Medicines are usually administered through oral and intravenous routes. However, nasal and pulmonary routes of drug delivery are also being used increasingly for the treatment of human diseases. For ensuring that the drugs and drug delivery are efficient and safe, and that the patients do not experience any discomfort, various aspects of drug delivery, namely, principles associated with drug preparation, site-specificity, route of administration, toxicity, and metabolism are taken into consideration. Controlled or modified-release formulations have the potential to alter the rate and timing at which a drug is released into the bloodstream of the patient. This helps to produce adequate or sustained drug concentrations. This book covers in detail some existent theories and innovative concepts revolving around drug delivery. Its aim is to present researches that have transformed the theoretical and practical aspects of this discipline and aided in its advancement. For all those who are interested in this area of study, this book can prove to be an essential guide.
