Displaying 34 results of Losartan Impurities Losartan is a commonly prescribed medication for treating high blood pressure. However, during the manufacturing process, impurities can be introduced into the drug, which can pose a risk to patients. These impurities can include N-nitrosodimethylamine (NDMA) and N-nitrosodiethylamine (NDEA), which are classified as probable human carcinogens. Regulatory agencies around the world are monitoring and issuing recalls of losartan-containing products with unacceptable levels of impurities. Patients taking losartan should speak with their healthcare provider to determine the best course of action.