Abstract
Despite its long history as a preferential cyclooxygenase-2 inhibitor, the topical application of etodolac in inflammatory disorders does not achieve the desired clinical efficiency because of its poor water solubility and poor skin permeation. In the ongoing study, phosalosomes were designed to mitigate the etodolac drawbacks and to enhance its skin localization. Hyaluronic acid was utilized to prepare a dermal gel for the alleviation of skin inflammation. Etodolac loaded hyaluronic acid phosalosomal gel had a sustainable release profile and 10.59-fold enhanced skin retention compared to free etodolac, with boosted skin tolerability on histopathological examination after acute and chronic applications. Confocal laser microscopy imaging indicated that the etodolac amounts accumulated in the liver and kidney following dermal application were 29 and 5.7-fold lower than those following the systemic dose, respectively. For in vivo studies, etodolac loaded hyaluronic acid phosalosomal gel presented superior anti-oedemic and significant anti-nociception potential. The promising homogenous localization highlighted its potential for the delivery of lipophilic drugs for the targeted treatment of other localized skin disorders.
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