The pharmacy warned the Food and Drug Administration to find a chemical believed to cause cancer in widely used blood pressure medications, as requested by the federal agency. , told the FDA last week that high levels of dimethylformamide were found in valsartan, a drug manufactured by the Swiss pharmaceutical company Novartis and other pharmaceutical companies. The medicine is used to treat hypertension in adults. The World Health Organization classifies dimethylformamide, or DMF, as a likely carcinogen for humans
. 1000 nanograms. The online pharmacy said it found that the cancer-causing chemical in valsartan was manufactured by five companies.
"The quality and safety of all our products are critical to Novartis," the spokesman added.
FDA did not respond immediately to CNBC's request
Several blood pressure medicines have already been recalled because of concerns about other chemicals that cause cancer. Earlier this month, Israeli company Teva Pharmaceuticals said it would extend the withdrawal of its heart medicines to losartan potassium after a carcinogen known as N-nitrosodimethylamine or NMBA has been detected. In April, Torrent Pharmaceuticals said it would also recall that Losartan and Camber Pharmaceutical told the FDA in February that they would recall the drug.