Marto Joana, Baltazar Diogo, Duarte Aida, Fernandes Adelaide, Gouveia Luís, Militão Maria, Salgado Ana, Simões Sandra, Oliveira Eduardo, Ribeiro Helena Margarida
Pharmaceutics, Faculdade de Farmácia da Universidade de Lisboa, Instituto de Investigação do Medicamento (iMed.ULisboa) , Lisboa , Portugal.
Pharm Dev Technol. 2015;20(6):710-5. doi: 10.3109/10837450.2014.915571. Epub 2014 May 5.
Non-steroid anti-inflammatory drugs (NSAIDs), such as etofenamate, are among the most prescribed drugs used for their analgesic, anti-rheumatic, antipyretic and anti-inflammatory properties. Topical formulations have the main advantage of targeted delivery. However, drugs must overcome the skin due to its role as a physical and chemical barrier against the penetration of chemicals and microorganisms. This barrier must be altered to allow the permeation of drugs at a suitable rate to the desired site of activity. Permeation modulators can intercalate the skin outer layers causing structure disruption, opening an energetically favourable route for the drug to diffuse through. The aim of this work was the development of hydroalcoholic gels containing 5.0% (w/w) of etofenamate for topical administration with anti-inflammatory activity and enhanced drug delivery. The physical and chemical characterization, in vitro release and permeation studies and in vivo anti-inflammatory activity were assessed. The gel with 30% ethanol showed in vivo anti-inflammatory activity with suitable physical chemical and microbiologic characteristics. In vitro release and permeation studies revealed that the different amounts of ethanol used influenced the release profiles of etofenamate. Moreover, it was demonstrated that this formulation is an adequate vehicle for the etofenamate skin permeation.
非甾体抗炎药(NSAIDs),如依托芬那酯,是因其镇痛、抗风湿、解热和抗炎特性而被最广泛处方使用的药物之一。局部用制剂的主要优点是靶向给药。然而,由于皮肤作为化学物质和微生物渗透的物理和化学屏障,药物必须穿透皮肤。必须改变这一屏障,以使药物以合适的速率渗透到所需的活性部位。渗透调节剂可以插入皮肤外层,导致结构破坏,为药物扩散开辟一条能量有利的途径。这项工作的目的是开发含5.0%(w/w)依托芬那酯的水醇凝胶用于局部给药,具有抗炎活性并增强药物递送。评估了其物理化学表征、体外释放和渗透研究以及体内抗炎活性。含30%乙醇的凝胶显示出体内抗炎活性,具有合适的物理化学和微生物学特性。体外释放和渗透研究表明,使用的不同量乙醇影响了依托芬那酯的释放曲线。此外,还证明该制剂是依托芬那酯皮肤渗透的合适载体。