| abstract |
The present invention relates to a percutaneous absorption enhancer that is excellent in the effect of promoting percutaneous absorption and has high safety and usability, and a transdermal absorption-type preparation comprising the percutaneous absorption enhancer. By blending the transdermal absorption enhancer of the present invention comprising (i) lactic acid and (ii) specific additives into a skin external preparation such as a patch preparation, the skin permeability of the drug can be significantly increased. it can. |