Dilept and GB-115 are original Russian neuroleptics of peptide structure. The specifics of their application, the wide range of pharmacological activity, and the high toxicity of these medicinal products make it necessary to introduce increasingly high quality standards. Thus, standardization of psychoactive drugs necessitates modern physicochemical methods of analysis, for which pharmacopoeia reference standards are required. Manufacturing pharmacopoeia reference standards for medicinal product research requires various organic solvents. It means that residual solvents need special control. The newly developed method of gas chromatography makes it possible to estimate the presence of residual organic solvents in the manufactured reference standards.