KEY POINTS A pharmacy warns the FDA that it found a chemical believed to cause cancer in a widely used blood pressure medication, according to a filing. Valisure told FDA that high levels of dimethylformamide were found in valsartan, a drug produced by Novartis and other pharmaceutical companies. A pharmacy warned the Food and Drug Administration that … More BP Med Warning! If You Take This, You Need To Speak To Your Doctor To Change It. It Can Cause Cancer.