Abstract
The effect of clobetasol 17-propionate (CP), a potent corticosteroid, in various cream bases on the permeation through artificial membrane was sought. Four formulations were then chosen for a further in vivo skin blanching assay. After calculation of the relationship between in vivo flux0–8hr determined from a surface recovery technique and in vitro release rate0–8hr of CP from various formulations, a high correlation coefficient of 0.9996 was achieved. Therefore, the in vitro release study could be used as an index to predict and evaluate the in vivo penetration capacity of CP cream to screen the effective formulation preclinically. After a series of in vivo investigations in this study, it was concluded that myristic acid-added formulations may show a bioequivalence with commercial Dermovate®. Furthermore, the flux calculated from the surface recovery technique and ΔE* detected from the skin blanching assay may be useful as parameters evaluating the quality and effectiveness of CP cream.
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