Nitrosamine Impurities in Angiotensin Receptor Blockers.

Nitrosamines are known carcinogens which have been recently discovered in several angiotensin receptor blockers (ARBs). This led to the recall of valsartan in the United States in 2018, and afterward, the recall of other ARBs as well as unrelated medications (e.g., ranitidine). The presence of nitrosamine in ARBs was likely a result of changes in the manufacturing process, although nitrosamine contamination is believed to occur by different mechanisms with other medications. The United States Food and Drug Administration has since taken steps to identify products affected by nitrosamine contamination and mitigate this concern going forward. Despite the contamination of some drug products, studies estimate that the overall risk to patients is low enough to not necessitate changes in prescribing patterns at this time.