Hyperkalemia is a side effect associated with which class of antihypertensive medications?

Hyperkalemia is a side effect associated with which class of antihypertensive medications?

• A. ACE inhibitors
• B. Beta blockers
• C. Diuretics
• D. Calcium channel blockers

Answer: (A)

Understanding how ACE inhibitors affect potassium balance helps explain the association with hyperkalemia. These drugs block the conversion of angiotensin I to angiotensin II, which lowers angiotensin II levels. Reduced angiotensin II leads to decreased aldosterone secretion from the adrenal glands. Aldosterone promotes potassium excretion in the distal tubule of the kidney; with less aldosterone, potassium is retained more, raising serum potassium levels. That’s why hyperkalemia can occur after starting an ACE inhibitor. Monitor potassium after initiation or dose changes, and be alert for symptoms like muscle weakness, fatigue, or palpitations that could reflect elevated potassium. The other common antihypertensive classes don’t typically cause hyperkalemia—diuretics usually cause potassium loss, beta blockers don’t directly raise potassium, and calcium channel blockers have little effect on potassium. If a patient is on a potassium-sparing diuretic or has kidney impairment, the risk of hyperkalemia increases.

Understanding how ACE inhibitors affect potassium balance helps explain the association with hyperkalemia. These drugs block the conversion of angiotensin I to angiotensin II, which lowers angiotensin II levels. Reduced angiotensin II leads to decreased aldosterone secretion from the adrenal glands. Aldosterone promotes potassium excretion in the distal tubule of the kidney; with less aldosterone, potassium is retained more, raising serum potassium levels. That’s why hyperkalemia can occur after starting an ACE inhibitor.

Monitor potassium after initiation or dose changes, and be alert for symptoms like muscle weakness, fatigue, or palpitations that could reflect elevated potassium. The other common antihypertensive classes don’t typically cause hyperkalemia—diuretics usually cause potassium loss, beta blockers don’t directly raise potassium, and calcium channel blockers have little effect on potassium. If a patient is on a potassium-sparing diuretic or has kidney impairment, the risk of hyperkalemia increases.