More than a half-million bottles of Prazosin Hydrochloride, a widely-used blood pressure medication are being recalled over concerns it contains unsafe levels of a cancer-causing chemical, with the drugmaker telling patients who take the pills to contact their doctor or pharmacy if they have the product.

New Jersey-based Pharmaceuticals USA Inc. initiated the recall Oct. 7 for 580,844 bottles of Prazosin Hydrochloride capsules that were distributed nationwide. According to Teva, the drugs come in doses of 1mg, 2mg and 5 mg.

In total, 55 lots of the pills were recalled. A full list of impacted lot codes can be found here .

An enforcement report from the Food and Drug Administration showed capsules were recalled because tests for the pills revealed "above acceptable intake limits for

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