Zestril 10mg tablets contain lisinopril, an ACE inhibitor medication used to treat high blood pressure (hypertension), heart failure, and improve survival after heart attacks. Each pack contains 28 tablets manufactured by AstraZeneca. The active ingredient lisinopril works by blocking the production of certain chemicals that tighten blood vessels, allowing them to relax and widen. This helps lower blood pressure and reduces strain on the heart. The recommended dose is typically one 10mg tablet taken once daily, though this may vary based on individual patient needs and doctor's instructions. This is a prescription-only medication that should be taken under medical supervision.