Abstract
Oral administration of medication is the first option when patient compliance is considered. However, many barriers face oral absorption of drugs that limit bioavailability in about 90% of therapeutic agents. Utilization of nanoparticulate drug delivery systems is a major strategy for increasing oral absorption. They can improve oral bioavailability through mechanisms such as protection of the drug in the GI tract, increasing cellular contact and residence time of the drug, protection of the drug from presystemic metabolism and efflux and increasing diffusion across the mucosal and epithelial layers. Liposomes are biocompatible carriers employed to improve oral bioavailability of drugs and in addition to the general advantages of nanocarriers for oral delivery, they offer benefits derived from their lipidic bilayer structure. They can better adhere to biomembranes, form mixed-micelle structures with bile salts to increase the solubility of poorly-soluble drugs and are suitable candidates for lymphatic uptake. They have been successful in improving oral bioavailability of a variety of compounds including peptide and proteins, hydrophilic and lipophilic drugs. Stability under GI conditions is the main concern for oral liposomes, ...Continue Reading
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