A drug prescribed to veterans suffering from post-traumatic stress disorder nightmares has been recalled for high traces of a chemical that could be cancerous.

Food and Drug Administration recalled half a million bottles of Prazosin, the Associated Press first reported last week. Prazosin is typically prescribed to help patients lower their blood pressure, but the drug is also prescribed for PTSD-related nightmares.

FDA notices issued late last month show recalls of the drug produced by two medication distributors: 100-pill bottles from Teva Pharmaceuticals USA and 20-pill cartons from Amerisource Health Services LLC. The FDA orders note that tests found nitrosamine impurities above the “acceptable intake limit” and could be potentially cancer-causing.

Pete Kasperowicz, a spokesperson f

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