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Self-nanoemulsifying drug delivery systems (SNEDDS) in both liquid and solid forms were suggested to improve water solubility of Doxazosin mesylate (DOX) a poorly water- soluble antihypertensive drug. Oleic acid: Smix (1:9 w/w) and Tween 80: co-surfactant mixture (Ethanol and PEG 400) (1:1, 2:1, 3:1 and 4:1) were chosen to prepare a liquid and solid forms of SNEDDS according to their solubility. TEM images revealed change in the crystalline nature of DOX into uniform particles with smooth surface. Characterization studies revealed droplet size ranges from 79.80±14.39 to 273.10±4.17 nm, zeta potential ranges from -5.57±0.10 to -21.13±0.46 mV and dissolution enhancement of more than two folds with more favorable properties for the solid forms. FTIR demonstrated significant physical changes in DOX crystalline structure. In conclusion, the solid SNEDDS containing oleic acid: Smix (1:9 w/w) and Tween 80: co-surfactant mixture (3:1 w/w) and adsorbent mixture of Avicel 101 and Aerosil 200 (40:1 w/w) might be a promising formula for better management of hypertension with expected shelf stability.
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