Teva Pharmaceuticals has launched a voluntary recall into two drugs used to treat high blood pressure as yet more medications face concerns over a possible cancer risk.

In a statement from Teva posted by the Food and Drug Administration, the recall affects all lots of combination tablets featuring the drugs amlodipine and valsartan and another combo drug featuring amlodipine, valsartan, and hydrochlorothiazide.

The drugs could contain an impurity called N-nitroso-diethylamine (NDEA), which has been classified as a possible human carcinogen, the FDA said.

Patients taking either drugs should contact their doctor or pharmacist for advice or alternative treatments. Stopping the drugs immediately with no comparable alternative could pose a greater risk to patients’ health, said Teva.

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