Which medication is used for chronic SIADH management?

Which medication is used for chronic SIADH management?

• A. Demeclocycline
• B. Prednisone
• C. Methimazole
• D. Furosemide alone

Answer: (A)

Chronic SIADH management focuses on reducing the kidney’s response to ADH so the body can excrete more free water and raise the sodium level. Demeclocycline does this by interfering with the ADH signaling in the collecting ducts, leading to aquaresis (water loss without solute loss). This blunts the antidiuretic effect, helping to correct hyponatremia when fluid restriction alone isn’t enough. It’s a classic option for long-term treatment because it directly counteracts the excess ADH effect. Be aware of potential nephrotoxicity and other side effects, and note that newer therapies targeting the ADH pathway are also used today. The other choices don’t address ADH action in the kidneys: prednisone isn’t used for SIADH, methimazole treats thyroid disease, and furosemide alone doesn’t fix the underlying ADH-driven water retention.

Chronic SIADH management focuses on reducing the kidney’s response to ADH so the body can excrete more free water and raise the sodium level. Demeclocycline does this by interfering with the ADH signaling in the collecting ducts, leading to aquaresis (water loss without solute loss). This blunts the antidiuretic effect, helping to correct hyponatremia when fluid restriction alone isn’t enough. It’s a classic option for long-term treatment because it directly counteracts the excess ADH effect. Be aware of potential nephrotoxicity and other side effects, and note that newer therapies targeting the ADH pathway are also used today. The other choices don’t address ADH action in the kidneys: prednisone isn’t used for SIADH, methimazole treats thyroid disease, and furosemide alone doesn’t fix the underlying ADH-driven water retention.