ACE Inhibitors: Uses, Mechanism, Benefits, Side Effects & Drug List Explained

ACE Inhibitors: Uses, Mechanism, Benefits, Side Effects & Drug List Explained

What Are ACE Inhibitors?

ACE inhibitors (Angiotensin-Converting Enzyme Inhibitors) are a class of medications used to lower high blood pressure, treat heart failure, and protect kidney function, especially in people with diabetes and hypertension. These drugs work by blocking the conversion of angiotensin I to angiotensin II, a hormone that normally causes blood vessels to tighten and narrow. When angiotensin II levels drop, blood vessels relax and widen, reducing blood pressure and easing the workload on the heart.

How ACE Inhibitors Work (Mechanism of Action)

1. Block ACE enzyme → reduces Angiotensin II production
   → Blood vessels dilate → blood pressure falls
2. Decrease Aldosterone secretion
   → Less sodium and water retention → lower blood volume
3. Increase Bradykinin (a natural vasodilator)
   → Helps vessel relaxation
   → May also cause dry cough (common side effect)

Common ACE Inhibitor Medications

Clinical Uses of ACE Inhibitors

ACE inhibitors are prescribed for:

Cardio-Renal Benefits

• Lowers arterial and venous pressure
• Decreases preload and afterload on the heart
• Reduces sympathetic nervous system stress
• Promotes excretion of excess salt and water
• Prevents harmful heart and blood vessel remodeling

Side Effects of ACE Inhibitors

Common (mild):

• Dry persistent cough (due to increased bradykinin)
• Dizziness or low blood pressure
• Fatigue
• Headache
• Metallic or salty taste

Moderate:

• Elevated potassium (hyperkalemia) – requires routine blood monitoring
• Skin rash or itching
• Decreased kidney filtration (temporary rise in creatinine)

Serious (rare but dangerous):

• Angioedema — swelling of face, lips, tongue, or throat (medical emergency)
• Severe kidney dysfunction
• Very low blood pressure

Drug & Food Interactions

Avoid:

• Salt substitutes (high in potassium)
• Potassium supplements
• NSAIDs (e.g., ibuprofen, diclofenac, naproxen) — may reduce drug effect
• Check all OTC supplements with your doctor.

Warnings

• Not safe during pregnancy (can cause fetal harm)
• Avoid use while breastfeeding
• Children may use selectively under specialist supervision

Key Points Summary

• ACE inhibitors relax blood vessels and lower blood pressure.
• They protect the heart and kidneys.
• Dry cough is the most common side effect.
• Avoid salt substitutes and NSAIDs while on therapy.
• Not recommended in pregnancy.

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