ACE Inhibitors: Effects, Uses & Side Effects
ACE inhibitors are medications that lower blood pressure and reduce the workload on the heart. They are used to treat hypertension, heart failure, and kidney disease.
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ACE inhibitors are medications that lower blood pressure and reduce the workload on the heart. They are used to treat hypertension, heart failure, and kidney disease.
What Are ACE Inhibitors?
ACE inhibitors (angiotensin-converting enzyme inhibitors) are a widely used class of medications primarily prescribed for high blood pressure (hypertension), heart failure, and certain kidney conditions. They are among the most commonly prescribed cardiovascular drugs worldwide.
Mechanism of Action
ACE inhibitors work by blocking the enzyme angiotensin-converting enzyme (ACE), which plays a central role in the renin-angiotensin-aldosterone system (RAAS) -- a hormonal system that regulates blood pressure and fluid balance.
Under normal conditions, ACE converts the inactive substance angiotensin I into the active form angiotensin II. Angiotensin II causes blood vessels to narrow, thereby raising blood pressure. By inhibiting ACE, less angiotensin II is produced, blood vessels relax, and blood pressure falls.
- Reduction of vascular resistance
- Decreased cardiac workload (reduced preload and afterload)
- Kidney protection by lowering pressure in the renal capillaries
- Inhibition of the breakdown of bradykinin, a vasodilatory substance
Indications
ACE inhibitors are prescribed for a wide range of conditions:
- Arterial hypertension (high blood pressure)
- Heart failure
- Post-myocardial infarction to protect cardiac function
- Diabetic nephropathy (kidney damage caused by diabetes)
- Chronic kidney disease to slow disease progression
- Coronary artery disease (CAD)
Common Active Ingredients
Well-known ACE inhibitors include:
- Ramipril – commonly used in heart failure and after heart attacks
- Lisinopril – widely prescribed for hypertension
- Enalapril – one of the oldest and most used ACE inhibitors
- Perindopril – used for hypertension and coronary artery disease
- Captopril – historically significant as the first approved ACE inhibitor
Dosage
The appropriate dose depends on the underlying condition, the patient´s kidney function, and individual response. Treatment is generally started at a low dose and gradually increased (titration). Most ACE inhibitors are taken once daily, though some are taken twice daily.
Patients with impaired kidney function or low blood pressure require careful dose adjustment and close monitoring.
Side Effects
ACE inhibitors are generally well tolerated. The most common side effects include:
- Dry, persistent cough – occurs in 5-20% of patients due to elevated bradykinin levels
- First-dose hypotension – excessive blood pressure drop at the start of treatment
- Elevated potassium levels (hyperkalemia) – especially when taken with potassium-sparing diuretics
- Impaired kidney function – possible in patients with renal artery stenosis
- Angioedema – rare but serious swelling of the face and throat; requires immediate discontinuation
Contraindications
ACE inhibitors must not be used in patients with:
- Known hypersensitivity to ACE inhibitors
- Pregnancy – contraindicated in the 2nd and 3rd trimester; may cause fetal harm
- Bilateral renal artery stenosis
- A history of angioedema related to prior ACE inhibitor use
- Concurrent use of aliskiren in patients with diabetes or renal impairment
Drug Interactions
Important interactions to be aware of when taking ACE inhibitors:
- Potassium-sparing diuretics and potassium supplements: Increased risk of hyperkalemia
- Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen: May reduce the antihypertensive effect and impair kidney function
- Lithium: ACE inhibitors can increase lithium blood levels
- Antidiabetic medications: May enhance blood glucose-lowering effects
References
- European Society of Cardiology (ESC) – 2023 ESC Guidelines for the Management of Arterial Hypertension, European Heart Journal (2023)
- Brunton L, Knollmann B – Goodman & Gilman's The Pharmacological Basis of Therapeutics, 14th Edition, McGraw-Hill (2023)
- National Institute for Health and Care Excellence (NICE) – Hypertension in Adults: Diagnosis and Management, NICE Guideline NG136 (2023), www.nice.org.uk
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