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Prazosin is a drug that relaxes blood vessels and is prescribed to help lower blood pressure. It may also be prescribed to treat nightmares and other sleep disturbances associated with post-traumatic stress disorder.

Teva recalled drugs after it discovered in tests that some capsules contained "above acceptable intake limits" for N-nitroso Prazosin impurity C, a cancer-linked chemical compound, NBC Chicago reported

The FDA said in enforcement orders posted online that it has given the affected lots of the drug a Class II risk classification because some of the recalled medication may have nitrosamine impurities that are considered potentially cancer causing.