Abstract
Liposomes are spherical vesicles composed of a bilayer (uni-lamellar) and/or a concentric series of multiple bilayer (multi-lamellar) separated by aqueous compartments formed by amphipathic molecules, such as phospholipids. Liposomes deliver drugs via encapsulation in inner aqueous or lipid compartments and have advantages such as control of drug release and distribution, alleviation of toxicity, and drug targeting. Since the launch of the first liposomal drug Doxil？？, a variety of products using a liposomal drug delivery system have been developed and commercialized. Recently, several drug candidates developed with sophisticated and diverse technologies have been undergoing clinical trials. In this review, the pharmaceutical characteristics of approved liposomal drugs are overviewed, and the recent advances in liposome technology through candidates in clinical trials are highlighted.
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