Other common names for the drugs include captopril, cilazapril and enalapri.

They work by reducing the activity of the angiotensin-converting enzyme, or ACE for short. By blocking this enzyme, the blood vessels relax and widen and blood pressure is lowered.

An estimated 103 million adults in the US, which is almost half the adult population, have high blood pressure, according to statistics this year from the American Heart Association.

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