title: Determination of therapeutic concentrations of codeine by high-performance liquid chromatography.
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003061:Codeine / Q000097:blood*; D006801:Humans; D008691:Methadone; D013997:Time Factors
chemical_list: D008691:Methadone; D003061:Codeine