The U.S. Food and Drug Administration has been investigating the presence of genotoxic impurities, called nitrosamines, in some types of drugs. Over the past year and a half, several drug products including angiotensin II receptor blockers (ARBs) and ranitidine, commonly known as Zantac, have been found to contain small amounts of nitrosamines such as N-Nitrosodimethylamine (NDMA). During this time, there has been an ongoing investigation into the presence of nitrosamines in other drug products. This effort is focused on ensuring the drugs used by Americans continue to meet strict quality standards.