Penetration enhancers (also called chemical penetration enhancers, absorption enhancers or sorption promotors) are chemical compounds that can facilitate the penetration of active pharmaceutical ingredients (API) into or through the poorly permeable biological membranes. These compounds are used in some pharmaceutical formulations to enhance the penetration of APIs in transdermal drug delivery and transmucosal drug delivery (for example, ocular, nasal, oral and buccal). They typically penetrate into the biological membranes and reversibly decrease their barrier properties.