What Is Zestril? Uses, Dosage, and What You Need to Know in 2026

Zestril is one of the most widely prescribed medications in the United States. If your doctor has prescribed it — or if you're researching it for yourself — here's everything you need to know about what Zestril is, what it treats, and how to take it safely.

What Is Zestril?

Zestril is a brand name for lisinopril, an angiotensin-converting enzyme (ACE) inhibitor. ACE inhibitors work by blocking an enzyme that causes blood vessels to narrow, allowing blood to flow more freely and reducing the workload on the heart.

Lisinopril has been available for nearly 30 years and is one of the most prescribed drugs in America. It's available as an inexpensive generic (simply called "lisinopril") and in other brand forms: Prinivil (mostly discontinued at retail) and Qbrelis (an oral liquid solution for patients who can't swallow pills).

What Is Zestril Used For?

Zestril has three FDA-approved uses:

1. High blood pressure (hypertension): Approved for adults and children aged 6 and older. It's a first-line treatment recommended by major cardiology guidelines (AHA/ACC).
2. Congestive heart failure: Used as add-on therapy (with diuretics and usually digoxin) to reduce symptoms and improve outcomes in adults with systolic heart failure.
3. Survival after heart attack: Prescribed to improve survival in hemodynamically stable adults within 24 hours of an acute myocardial infarction.

Common off-label uses include diabetic nephropathy (kidney protection in diabetes), chronic kidney disease, and Alport syndrome.

Zestril Dosage: How Much Do You Take?

Zestril is available in 2.5 mg, 5 mg, 10 mg, 20 mg, 30 mg, and 40 mg tablets. Typical dosing by indication:

• Hypertension (adults): 10 mg once daily initially; 20-40 mg once daily as maintenance; maximum 80 mg/day
• Heart failure: 5 mg once daily initially; titrate up to 40 mg/day max
• Post-MI: 5 mg within 24 hours, 5 mg after 24 hours, 10 mg after 48 hours, then 10 mg once daily
• Children (hypertension, age 6+): 0.07 mg/kg once daily (up to 5 mg) initially

Kidney impairment requires dose adjustment. Your doctor will determine the right dose and schedule for you.

How to Take Zestril

Zestril (lisinopril) is:

• Taken by mouth (oral tablet or liquid)
• Usually taken once daily at the same time each day
• Can be taken with or without food
• Should be taken consistently, even when you feel well — high blood pressure often has no symptoms
• Stored at room temperature, away from moisture and heat; do not freeze

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Who Should NOT Take Zestril?

Do not take Zestril if you:

• Have a history of angioedema (severe swelling) from any ACE inhibitor
• Are pregnant — can cause serious fetal harm or death (Black Box Warning)
• Take aliskiren (Tekturna) and have diabetes
• Have taken sacubitril/valsartan (Entresto) within the past 36 hours
• Are allergic to lisinopril or any other ACE inhibitor

Is Zestril a Controlled Substance?

No. Zestril (lisinopril) is not a controlled substance. It is not scheduled by the DEA. It can be prescribed by any licensed healthcare provider, including through telehealth, and refills are generally straightforward.

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How Much Does Zestril Cost?

Generic lisinopril is one of the most affordable prescription medications available. With a GoodRx coupon, a 30-day supply can cost as little as $6.14. Most insurance plans cover it as a Tier 1 preferred generic with $0-$15 copays. For more detail, see our guide on how to save money on Zestril.