SEARCH Articles Figures Tables Absorption energy, surfactant Absorption enhancers nonionic surfactants Absorption enhancers surfactants Absorption of Surfactants Absorption surfactants, effect Cationic surfactant absorption Drug absorption surfactant effects Effect of surfactants on drug absorption Rectal drug absorption surfactants Surfactants absorption testing effects Surfactants as absorption enhancers Surfactants enhanced gastrointestinal absorption Surfactants) absorption promoters