This medicine is a brand name for the drug lisinopril, which belongs to a class of medications known as ACE (Angiotensin-Converting Enzyme) inhibitors.
It is primarily used to treat high blood pressure (hypertension), heart failure, and to improve survival after a heart attack.
The 20 mg dosage indicates the strength of each tablet, and the packaging typically contains 28 tablets.

Benefits:
-Lowering Blood Pressure: Zestril effectively reduces blood pressure, which helps prevent strokes, heart attacks, and kidney problems.
-Heart Failure Management: It can improve symptoms in patients with heart failure and enhance exercise tolerance.
-Improved Quality of Life in Hypertensive Patients: By effectively managing blood pressure, this medicine contributes to an improved quality of life for hypertensive patients, reducing symptoms such as headaches, fatigue, and anxiety related to high blood pressure
-Post-Myocardial Infarction: Zestril is beneficial in improving survival rates following a heart attack by reducing the workload on the heart.
-Kidney Protection: It may help protect kidney function in patients with diabetes or other conditions that affect the kidneys.

Precautions:
-Allergic Reactions: Patients should inform their healthcare provider if they have a history of allergic reactions to lisinopril or other ACE inhibitors.
-Pregnancy and Breastfeeding: Zestril is contraindicated during pregnancy as it can harm fetal development. Caution is advised for breastfeeding mothers.
-Kidney Function Monitoring: Regular monitoring of kidney function is necessary, especially in patients with pre-existing kidney issues or those taking diuretics.
-Electrolyte Imbalance: Patients should be monitored for hyperkalemia (high potassium levels) as lisinopril can increase potassium levels in the blood.

Side Effects:
-Common side effects include dizziness, headache, persistent cough, fatigue, and gastrointestinal disturbances such as nausea or diarrhea.
-Serious side effects may include angioedema (swelling of deeper layers of skin), liver dysfunction, renal impairment, and severe hypotension (low blood pressure).
-If any severe allergic reactions occur (e.g., rash, difficulty breathing), immediate medical attention should be sought.

Main Ingredients and Their Benefits:
-Lisinopril is an angiotensin-converting enzyme (ACE) inhibitor that is primarily used to treat high blood pressure (hypertension) and heart failure, as well as to improve survival after a heart attack.
-Lisinopril is able to lower blood pressure by relaxing blood vessels, which helps reduce the workload on the heart and lowers the risk of stroke and heart attack.