Spironolactone dietary interactions

Question

A nurse in an outpatient clinic is reinforcing medication teaching with an adult client who takes spironolactone daily for heart failure. Which client statement indicates a dietary practice that increases the risk of severe hyperkalemia?

1. A"I use a commercial potassium chloride salt substitute on all my cooked vegetables."✓ Correct

   Spironolactone retains potassium; adding potassium-based salt substitutes substantially increases the risk of life-threatening hyperkalemia.

2. B"I drink two glasses of unsweetened cranberry juice each morning with breakfast."✗ Incorrect

   Cranberry juice is not high in potassium and does not create an adverse interaction with spironolactone.

3. C"I flavor my soups and salads with garlic powder and fresh lemon juice."✗ Incorrect

   Herbs, garlic powder, and lemon juice are potassium-free seasoning alternatives that are safe with potassium-sparing diuretics.

4. D"I take an over-the-counter calcium carbonate tablet with lunch every day."✗ Incorrect

   Calcium carbonate does not raise serum potassium levels or trigger hyperkalemia with spironolactone.

Answer

A. "I use a commercial potassium chloride salt substitute on all my cooked vegetables."

Rationale

Spironolactone is an aldosterone antagonist that promotes sodium excretion while retaining potassium in the distal renal tubules. Ingesting potassium-rich supplements or salt substitutes manufactured with potassium chloride compounds this effect and can lead to dangerous elevations in serum potassium. Clients taking spironolactone should be taught to avoid potassium salt substitutes and to report symptoms such as muscle weakness or palpitations.