Teva Pharmaceuticals has launched a voluntary recall into two drugs used to treat high blood pressure. The recall affects all lots of combination tablets featuring the drugs amlodipine and valsartan and another combo drug featuring amlodipine, valsartan, and hydrochlorothiazide. All of these drugs are being recalled due to the possibility that they are contaminated with organic chemical N-nitrosodiethylamine (NDEA), which is used to make liquid rocket fuel and is classified as a probable human carcinogen. 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. Customers and patients with questions can contact Teva by phone at 888-838-2872, or email at email@example.com.