Our inspection found that analysts performed multiple gas chromatography (GC) analyses of [redacted] samples for residual solvents. Analysts performed these unofficial analyses and recorded them in separate “R&D” folders before conducting the officially reported sample analyses. The original, unofficial analyses stored in separate R&D folders were not part of the official quality control records for your API, and your firm did not consider the results of these unofficial analyses to evaluate the quality of your API or make batch release decisions for numerous batches of API.
Our investigator reviewed chromatograms found in the R&D folders and noted that some displayed large unknown peaks that were not reported in the official records for the same samples. The presence of such peaks in the chromatograms may indicate the presence of unknown and uncharacterized impurities (including potential contaminants) in your drugs.
View the original warning letter.