Polyscientech Co. Ltd 1 article published in JoVE Medicine Evaluation of Drug Sorption to PVC- and Non-PVC-based Tubes in Administration Sets Using a Pump Su-Eon Jin1,2,3, Siwon You1,3, Seungho Jeon4, Hyo-Jin Byon2, Sung-Joo Hwang1,3 1College of Pharmacy, Yonsei University, 2College of Medicine, Yonsei University, 3Yonsei Institute of Pharmaceutical Sciences, 4Polyscientech Co. Ltd We report a method for drug sorption evaluation using a pump and model drugs (diazepam and tacrolimus). After drug analysis using high-performance liquid chromatography, drug concentrations and sorption levels in the tubes of administration sets are calculated.