ICH Guide on Residual Solvents
FDA has posted an International Council for Harmonization guidance entitled Q3C(R8) Impurities: Guidance for Residual Solvents. The document provides recommendations for permitted daily exposures for three residual solvents: (1) 2-methyltetrahydrofuran, (2) cyclopentyl methyl ether, and (3) tert-butyl alcohol. It is intended to recommend acceptable amounts for these residual solvents in pharmaceuticals that will provide adequate patient safety. To view the guidance, click here.