Which class should avoid salt substitutes due to hyperkalemia risk?

Which class should avoid salt substitutes due to hyperkalemia risk?

• A. Potassium-sparing diuretics
• B. Thiazide diuretics
• C. Osmotic diuretics
• D. Loop diuretics

Answer: (A)

Potassium-sparing diuretics should avoid salt substitutes because they raise the risk of dangerous hyperkalemia. These diuretics work in the collecting duct to preserve potassium: aldosterone antagonists (like spironolactone and eplerenone) reduce potassium excretion, and ENaC blockers (like amiloride and triamterene) lessen the electrochemical drive to secrete potassium into the urine. Salt substitutes typically supply potassium chloride to replace salt, so using them while on potassium-sparing diuretics adds more potassium to the body and impairs its removal. This combination can push serum potassium into a dangerous range, especially if kidney function is limited or the patient is also taking other potassium-raising medications. In contrast, loop or thiazide diuretics promote potassium loss, and osmotic diuretics don’t carry the same hyperkalemia risk with salt substitutes.

Potassium-sparing diuretics should avoid salt substitutes because they raise the risk of dangerous hyperkalemia. These diuretics work in the collecting duct to preserve potassium: aldosterone antagonists (like spironolactone and eplerenone) reduce potassium excretion, and ENaC blockers (like amiloride and triamterene) lessen the electrochemical drive to secrete potassium into the urine. Salt substitutes typically supply potassium chloride to replace salt, so using them while on potassium-sparing diuretics adds more potassium to the body and impairs its removal. This combination can push serum potassium into a dangerous range, especially if kidney function is limited or the patient is also taking other potassium-raising medications. In contrast, loop or thiazide diuretics promote potassium loss, and osmotic diuretics don’t carry the same hyperkalemia risk with salt substitutes.