Abstract
Purpose. To further increase the transdermal transport rate of R-apomorphine, a nonocclusive pretreatment with an aqueous surfactant formulation in combination with iontophoresis was explored in vitro.
Methods. The human stratum corneum was pretreated nonocclusively with formulations composed of laureth-3 oxyethylene ether (C12EO3), laureth-7 oxyethylene ether (C12EO7), and cholesterol sulfate (CSO4) prior to iontophoresis. The effect on the flux of the following parameters was examined: the composition, the charge, and the applied amount of surfactant formulations.
Results. The iontophoretic flux of R-apomorphine was appreciably increased by pretreatment with surfactant formulations. A formulation containing C12EO3/C12EO7/CSO4 at a molar ratio of 70:30:5 was very stable and increased the iontophoretic flux of R-apomorphine from 92.2 ± 13.9 nmol/cm2*h to 181.5 ± 22.6 nmol/cm2*h. When further increasing the negative charge of this formulation the iontophoretic transport rate was slightly inhibited. A dose of 40 μL/cm2 of the formulation with a total surfactant concentration of 5% (w/w) was sufficient for a maximum enhancing effect.
Conclusions. The results obviously show that nonocclusive pretreatment with the surfactant formulation enhances the iontophoretic transport of R-apomorphine, and is a promising approach to achieve therapeutic concentrations of R-apomorphine.
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Li, G.L., Danhof, M., Frederik, P.M. et al. Pretreatment with a Water-Based Surfactant Formulation Affects Transdermal Iontophoretic Delivery of R-Apomorphine in Vitro . Pharm Res 20, 653–659 (2003). https://doi.org/10.1023/A:1023211219118
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DOI: https://doi.org/10.1023/A:1023211219118