In further work, the ethosomal technology was broadened to introduce agents into cultured cells and microorganisms. Preliminary studies with plasmids and insulin revealed that the ethosomal carrier may be used for enhanced delivery of these agents. Results obtained in a double-blind two-armed randomized clinical study showed that treatment with the ethosomal acyclovir formulation significantly improved all the evaluated parameters. Because of their unique structure, ethosomes are able to encapsulate and deliver through the skin highly lipophilic molecules such as cannabinoids, testosterone, and minoxidil, as well as cationic drugs such as propranolol and trihexyphenidil. This article reviews work carried out in vitro, in vivo, in animal models, and in humans with various ethosomal systems incorporating a wide range of drugs. Ethosomes are soft, malleable vesicles tailored for enhanced delivery of active agents. Although ethosomal systems are conceptually sophisticated, they are characterized by simplicity in their preparation, safety, and efficacy-a combination that can highly expand their application. Ethosomes are noninvasive delivery carriers that enable drugs to reach the deep skin layers and/or the systemic circulation.
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