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Typically in the pharmaceutical industry, drug products exist in two dosage forms, solid and liquid dosage forms. Included in solid dosage forms are tablets, pellets, pills, beads, spherules, etc. These solid dosage forms are often coated for various reasons, such as odor or taste masking, prevention from moisture, light and/or air, protection from destruction by gastric acid or gastric enzymes, enhanced mechanical strength, aesthetics or controlled release including controlling release sites and/or release rate.

Liposomes as well as formulations based on drug-lipid complexes have been extensively investigated for the delivery of a wide range of pharmaceutical compounds. Commercial licensing of liposomal dispersions for parenteral and topical use in humans has been fairly recent and has occurred as a result of interdisciplinary scientific advances in surface chemistry, membrane biophysics, and molecular pharmacology. These developments were supported by pioneering contributions from scientists in the fields of molecular pharmaceutics, drug delivery, and chemical engineering. Thus, since their original...