(CNN)There's no end in sight for one of the largest prescription drug recalls in recent memory. The US Food and Drug Administration is continuing an investigation and recall of a class of drugs used by millions that began last summer, yet there's still "more to find," an agency director says.
FDA official says ongoing blood pressure drug investigation will probably uncover more tainted pills
Starting in July, separate lots of blood pressure medications from various companies were pulled from pharmacy shelves. They're known as angiotensin II receptor blockers or ARBs and contain either valsartan, losartan or irbesartan. The reason? These blood pressure drugs contained impurities that pose a cancer risk to users.