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Liposomes are an efficient novel drug delivery system. They are used because of their structure which is stable and due to their ability to accommodate both lipophilic and hydrophilic drug. Various fascinating types of liposomes have been developed in recent past to further enhance their utility. Long-circulating liposomes or stealth liposomes are able to hide from the defence system of the body and circulate for a longer time in the blood. Targeted liposomes namely immuno-liposomes consists of antibodies conjugated on their surface to improve the specificity of the cell. Liposomes have been modified as per the conditions of pH and temperature, specifically designed to improve drug delivery to targeted tumor cells. Liposomes are being used in the treatment of various diseases and there are various liposomal drug formulations available today. Liposomes can be used as carriers for genetic materials such as antisense, DNA, RNA which are useful in the treatment of diseases. Liposomes are also efficient carriers of cytokines which further activate macrophages. This review provides the detailed insight of types and applications of liposomes and the potential challenges in the development of liposomal drug delivery systems.

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