Copyright CBS News

The Federal Drug Administration said drugmakers have recalled more than 580,000 bottles of a blood pressure medication over concerns that it may include a cancer-causing chemical. New Jersey-based drugmaker Teva Pharmaceuticals USA and drug distributor Amerisource Health Services issued voluntary nationwide recalls earlier this month of over half a million bottles of various strengths of prazosine capsules, according to the FDA. The capsule drug, known as prazosin hydrochloride, comes in 1 mg, 2 mg and 5 mg doses. It helps relax blood vessels to facilitate blood flow and is sometimes prescribed for nightmares and other sleep disturbances caused by post-traumatic stress disorder. Teva Pharmaceuticals did not immediately respond to a request for comment.