Penetration of transdermal enhancers on percutaneous permeation of Sinomenine Gels in vitro Determination of in vitro release rule of new type Shangshi Zhitong Plaster Determination of in vitro release rule of new type Shangshi Zhitong Plaster Studies on cutaneous permeation in vitro of Kushen recipe gel Determination of percutaneous absorption characteristics of Panax notoginseng saponins transfersomes by in vitro skin permeation method