Lotensin HCT is used to lower high blood pressure in adults by allowing the blood vessels to relax and reducing the volume of the blood. Lotensin HCT is not a cure for high blood pressure, but it can lower the risks associated with long-term high blood pressure, such as a heart attack, stroke, or congestive heart failure. Lotensin HCT has not been approved for use in children and, at this time, there are no universally accepted off-label Lotensin HCT uses.