Abstract
AbstractThe effects of vehicles and skin permeation enhancer on the skin permeation of dideoxynucleoside-type anti-HN drugs, Zalcitabine (DDC), Didanosine (DDI), and Zidovudine (AZT), alone and in combination, were compared using hairless rat and human cadaver skins. Each drug alone or a combination of three drugs was added to various compositions of ethanol/water or ethanol/tricaprylin cosolvent system to saturation, and in vitro skin permeation studies were conducted using Valia-Chien skin permeation cells. In both ethanol/water and ethanol/tricaprylin systems, the hairless rat skin permeation rates achieved by each drug alone and three drugs in combination were not significantly different. Addition of oleic acid [1.0% (v/v) for each drug alone and 5.0% (v/v) for drug combination] in ethanol/tricaprylin (50:50) could not significantly enhance the skin permeation of these drugs. In hairless rat skin permeation of each drug alone, the permeation rates of all three drugs were dramatically enhanced with the...
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