Profiles of Drug Substances, Excipients, and Related Methodology, Volume 43 presents comprehensive reviews of drug substances and additional materials, with critical review chapters that summarize information related to the characterization of drug substances and excipients. The series encompasses review articles and database compilations that fall within a variety of categories, with this release focusing on Ganciclovir, Mirtazapine, Tolfenamic Acid, Mid-Infrared Spectroscopy of Pharmaceutical Solids, and the Validation of Chromatographic Methods of Analysis: Application for drugs that derived from herbs.