Lisinopril

High Blood Pressure

Lisinopril is used to treat hypertension (high blood pressure) in adults and children who are at least 6 years old. It may be prescribed alone or in combination with other medications, such as diuretics. Lowering blood pressure helps reduce the risk of serious health complications, including strokes, heart attacks, and kidney problems.

Heart Failure

This medication is used to manage heart failure, a condition where the heart is unable to pump blood effectively. It is typically used in combination with other drugs, such as diuretics and digitalis, to help improve symptoms and increase the chances of survival.

Heart Attack Recovery

Lisinopril is used to improve survival in patients who have recently experienced a heart attack. When started within 24 hours of a heart attack, it can help protect the heart and reduce the risk of death.

How Lisinopril Works

Lisinopril belongs to a class of medications called angiotensin-converting enzyme (ACE) inhibitors. It works by blocking the action of a specific enzyme in the body that produces angiotensin II, a substance that causes blood vessels to tighten and narrow.

By preventing the production of angiotensin II, lisinopril helps the body achieve the following:

• Blood Vessel Relaxation: When blood vessels relax and widen, blood can flow through them more easily.
• Lower Blood Pressure: The relaxation of the vessels directly leads to a decrease in blood pressure levels.
• Reduced Cardiac Workload: Because the blood vessels are wider, the heart does not need to pump as forcefully to move blood through the circulatory system.

In conditions like heart failure or following a heart attack, these effects help the heart pump more efficiently and can improve the supply of oxygen-rich blood to the rest of the body.

Common Side Effects

Some people may experience mild side effects while taking lisinopril. These often include:

• Dry, persistent cough
• Dizziness or lightheadedness
• Headache
• Tiredness
• Nausea or diarrhea
• Sneezing or runny nose
• Rash
• Decreased sexual ability

Serious Side Effects

Seek medical help immediately if you experience any of the following serious symptoms:

• Swelling of the face, throat, tongue, lips, eyes, hands, or lower legs
• Difficulty breathing or swallowing
• Hoarseness
• Yellowing of the skin or eyes
• Fever, sore throat, or other signs of infection
• Fainting
• Chest pain

This medication can also cause high potassium levels in the blood. Your doctor may perform regular blood tests to monitor your kidney function and potassium levels.

Fetal Toxicity

Lisinopril has a boxed warning because it can cause serious injury or death to a developing fetus when used during pregnancy. If pregnancy is detected, this medication should be discontinued as soon as possible.

Angioedema and Allergic Reactions

Serious and potentially life-threatening allergic reactions, known as angioedema, can occur at any time during treatment. This involves swelling of the face, extremities, lips, tongue, glottis, or larynx, which can obstruct the airway. The risk of angioedema may be higher in Black patients or individuals with a history of the condition.

Hypotension (Low Blood Pressure)

Excessive low blood pressure can occur, especially in patients who are salt- or volume-depleted due to diuretic therapy, dietary salt restriction, dialysis, diarrhea, or vomiting. Hypotension is most likely to happen when first starting the medication or when the dosage is increased.

Kidney and Liver Function

• Kidney Impairment: Lisinopril may cause changes in kidney function, particularly in patients with severe heart failure or renal artery stenosis. Monitoring of renal function is typically required during therapy.
• Liver Effects: Rarely, ACE inhibitors have been associated with a syndrome that starts with yellowing of the skin or eyes (jaundice) and can progress to severe liver failure.

Potassium Levels

Treatment with lisinopril can lead to high levels of potassium in the blood (hyperkalemia). Risk factors for this condition include kidney impairment, diabetes, and the use of potassium-sparing diuretics or potassium supplements.

Contraindications

Lisinopril should not be used by individuals who have a history of angioedema related to previous treatment with an ACE inhibitor, or those with hereditary or idiopathic angioedema. It is also contraindicated for use in combination with aliskiren in patients with diabetes.

Other Precautions

• Cough: A persistent, nonproductive cough may develop during treatment but usually resolves after the medication is stopped.
• Anaphylactoid Reactions: Sudden, severe allergic reactions may occur during certain medical procedures, such as hemodialysis with specific high-flux membranes or desensitization treatment for insect stings.

Pregnancy

Lisinopril should not be used during pregnancy. Taking this medication during the second or third trimesters can cause serious injury or even death to the developing fetus. Potential risks to the baby include:

• Kidney failure
• Low blood pressure
• Underdeveloped skull bones
• Underdeveloped lungs
• Death

If you are planning to become pregnant or discover you are pregnant while taking lisinopril, contact your healthcare provider immediately. They will typically transition you to a different medication that is safer to use during pregnancy.

Breastfeeding

It is not known whether lisinopril passes into human breast milk. Because of the potential for serious adverse reactions in nursing infants, healthcare providers generally advise caution. A decision should be made whether to discontinue nursing or discontinue the drug, taking into account the importance of the medication to the mother's health.

Discuss your options with your doctor if you are breastfeeding or planning to breastfeed while taking lisinopril.

Available Forms

Lisinopril is primarily administered by mouth. The available forms include:

• Oral Tablet: This is the standard form of the medication taken by mouth.
• Oral Solution: A liquid formulation is available for patients who may have difficulty swallowing tablets.

FDA Approval and Indications

Lisinopril is approved by the U.S. Food and Drug Administration (FDA) for several cardiovascular conditions. It is indicated for the treatment of hypertension (high blood pressure) in adults and children 6 years of age and older. It is also used as an add-on treatment for heart failure and to improve survival rates following a heart attack.

Boxed Warning

Lisinopril carries a boxed warning regarding its use during pregnancy. Exposure to the drug during the second and third trimesters can cause serious injury or death to the developing fetus. Patients should stop taking lisinopril immediately if they become pregnant.

Safety Communications

The FDA has issued safety warnings regarding the use of lisinopril in combination with certain other drugs. It should not be used with aliskiren in patients with diabetes. Combining these medications increases the risk of kidney impairment, dangerously low blood pressure, and high potassium levels in the blood.

Risks of Abrupt Discontinuation

Lisinopril is used to manage chronic conditions such as high blood pressure and heart failure. It controls these conditions but does not cure them. If you stop taking lisinopril abruptly, you may experience a rapid return of high blood pressure, often referred to as rebound hypertension. This sudden increase in blood pressure can put significant strain on your heart and blood vessels.

Potential risks of stopping the medication without medical guidance include:

• Chest pain (angina)
• Heart attack
• Stroke
• Worsening symptoms of heart failure, such as increased swelling or shortness of breath

Managing Treatment Changes

It is essential to continue taking lisinopril even if you feel well, as high blood pressure often has no symptoms. You should not stop taking this medication or change your dose without consulting your healthcare provider. If you need to discontinue lisinopril due to side effects or other medical reasons, your doctor will typically monitor you closely and may suggest gradually reducing your dose to allow your body to adjust safely.