Drugmaker Pfizer has announced a voluntary recall of its blood pressure medication Accuretic and two authorized generic versions.

An impurity called N-nitroso-quinapril was found in six lots of Accuretic, one lot of generic quinapril and hydrochlorothiazide, and another four lots of quinapril HCl/hydrochlorothiazide tablets, according to Pfizer.

This compound is one of several known as nitrosaminesTrusted Source. Read more HERE.