Question 1
A 62-year-old African American female started on amlodipine 10 mg daily 4 weeks ago. Her blood pressure is 128/78 mmHg. She complains of new bilateral ankle swelling. On examination, her lungs are clear, no JVD is present. Which intervention is most appropriate?
▸ Why B is the answer
Peripheral edema is a very common, dose-dependent side effect of dihydropyridine calcium channel blockers like amlodipine. This occurs because the medication causes preferential precapillary vasodilation, which increases capillary hydrostatic pressure and forces fluid into the interstitial space, rather than causing systemic volume overload. Because the patient's lungs are clear and there is no jugular venous distention, clinical heart failure is highly unlikely, making an echocardiogram unnecessary. Prescribing a daily loop diuretic is inappropriate because this specific type of edema is not driven by total body fluid retention. Reducing the amlodipine dose or adding an ACE inhibitor helps normalize the capillary hydrostatic pressure and typically resolves the edema. Leg elevation alone is usually insufficient.
🔑 Key takeaway
Dihydropyridine CCB-induced edema is managed by dose reduction or adding an ACE inhibitor or ARB.

