Permeation Efficacy of a Transdermal Vehicle with Steroidal Hormones and Nonsteroidal Anti-inflammatory Agents as Model Drugs

Background: Transdermal delivery is an alternative route for the administration of drugs. However, it requires the development of vehicles that allow the drugs to cross the layers of the skin and reach the systemic circulation. Objective: In this study, a new transdermal vehicle was evaluated using progesterone, estradiol, estradiol + estriol (Biest) and ketoprofen administered as model drugs. </P><P> Methods: To evaluate the ex vivo permeation of the drugs, the Franz vertical diffusion cell with human skin was used. Results: After 24 h, the vehicle was able to deliver 18.32 &#181;g/cm2 of progesterone and 92.07 &#181;g/cm2 of ketoprofen through the skin to the receptor medium. The permeation percentages were 91%, 78.8%, 48.5%, 73.2%, and 63.6%, respectively, for estradiol, estradiol (Biest), estriol (Biest), progesterone and ketoprofen. For all drugs, sufficient amounts were delivered to achieve a systemic effect, and it was also possible to decrease the amount of emulsion applied. Thus, the vehicle demonstrated a high performance and the possibility of it being used for drugs that present difficulties in regards to administration by the transdermal route.