Pfizer (NYSE:PFE) has announced a voluntary recall of five lots of Accupril (Quinapril HCl) tablets owing to elevated levels of the nitrosamine N-nitroso-quinapril.  Accupril, an angiotensin-converting enzyme (ACE) inhibitor, is indicated for treating hypertension. FDA has also approved its use as an adjunctive therapy for treating heart failure.  N-nitroso-quinapril, which can be frequently found in…