Zestril 5mg tablets contain lisinopril dihydrate, an ACE inhibitor medication used to treat high blood pressure, heart failure, and improve survival after heart attacks. Each pack contains 28 tablets manufactured by AstraZeneca. The active ingredient is lisinopril dihydrate equivalent to 5mg anhydrous lisinopril per tablet. This medication requires a prescription and should be taken under medical supervision. The product packaging clearly states it should not be used during pregnancy and patients should consult their doctor and refer to the included leaflet for complete information. Store at room temperature away from moisture and heat.