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Liposomes, vesicles with one or more lipid bilayers entrapping an inner aqueous core, are widely used as drug delivery systems. When liposomes are smaller than 100 nanometers (nano liposomes) they have a unique capability of selectively accumulating in tumors and inflamed tissues. This phenomenon, known as the enhanced permeability and retention (EPR) effect, is related to the relatively high leakiness´ of blood vessels in these diseased tissues. In this book, we present a novel approach for triggering drug release from liposomes at the target site, by use of a remote trigger low frequency ultrasound. The book includes detailed descriptions of formulation, characterization, and in vivo performance of liposome-based drugs, with focus and insights into the biophysical phenomena governing ultrasound-induced liposomal drug release. Special attention is given to the principles needed to formulate ultrasound-responsive liposomes. The book is intended for people entering the field of liposome-based drug delivery as well as experienced scientists seeking fundamental understanding of the mechanism by which ultrasound interacts with lipid bilayers.

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