Mylan said on Tuesday it is issuing a nationwide voluntary recall of all lots of its blood pressure medicine valsartan, expanding a recall of select batches initiated two weeks ago.

The drugmaker said it was recalling 104 additional lots "out of an abundance of caution" after the valsartan-containing products were found to contain traces of a probable cancer-causing impurity.

The finished products, which were manufactured by Mylan Pharmaceuticals and Mylan Laboratories were distributed in the United States between March 2017 and November 2018, the company said in a statement.

Shares of the company fell 2 percent to $33.40 after the announcement.

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