(NEXSTAR) – Nearly 590,000 bottles of blood pressure drugs have been recalled over concerns that they may contain a potentially carcinogenic chemical that exceeds the “acceptable intake limit.”

The medications affected by the recall — prazosin hydrochloride — were recalled earlier this month by Teva Pharmaceuticals USA (which initiated its recall on Oct. 7) and Amerisource Health Services (Oct. 26). Enforcement reports published by the U.S. Food and Drug Administration indicate the capsules may contain nitrosamine impurities above the “Carcinogenic Potency Categorization Approach (CPCA)” limit.

According to the FDA, N-nitrosamine impurities are a class of potentially cancer-causing chemicals that can form during the manufacture or storage of a drug.

The enforcement reports show that on

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