Which ACE inhibitor comes in an IV formulation known as enalaprilat?

Enalapril is the correct answer because it is the only ACE inhibitor that is available in an intravenous formulation known as enalaprilat. This formulation allows for immediate administration and is useful in situations such as hypertensive emergencies or when oral administration is not feasible due to factors like nausea or impaired swallowing.

While other ACE inhibitors like ramipril, quinapril, and captopril are effective oral medications for managing conditions such as hypertension and heart failure, they do not have an intravenous form. Captopril can be given subcutaneously but not as an intravenous formulation like enalaprilat. This unique characteristic of enalaprilat makes it particularly important in acute medical settings where rapid blood pressure control is necessary.