Final answer:
Natrecor is the medication that is a human brain natriuretic peptide (BNP) preparation, used to treat congestive heart failure by promoting diuresis and vasodilation.
Step-by-step explanation:
The medication that is a human brain natriuretic peptide (BNP) preparation is Natrecor. Natrecor, generically known as nesiritide, is a recombinant form of B-type natriuretic peptide and is used in the treatment of congestive heart failure. B-type natriuretic peptide is naturally produced by the heart in response to heart failure and similar conditions to promote diuresis and vasodilation, helping reduce the workload on the heart.
Other medications listed such as Captopril, Enalapril, and Metoprolol serve different roles in cardiac care. Captopril and Enalapril are both ACE inhibitors, which help in relaxing blood vessels and reducing blood pressure by preventing the formation of angiotensin II. Metoprolol is a beta blocker that works by blocking the beta-1 receptors, thereby slowing the heart rate and lowering blood pressure, but it may lead to side effects such as bradycardia or even stoppage of the heart if overprescribed.