Sodium Tetradecyl Sulfate Injection 3%, Multiple-Dose Vials 2 mL x 5/BoxSodium tetradecyl sulfate 3% injection is a sterile, nonpyrogenic sclerosing agent used to treat small, uncomplicated varicose veins in the legs as well as certain vascular malformations. It is marketed under the brand name Sotradecol, among others. How it works Sodium tetradecyl sulfate (STS) is an anionic surfactant, similar to soap, that is injected directly into the affected vein. Its action involves three main steps: Endothelial damage: STS