Today I had a patient who was hyponatremic. The doc ordered Salt tablet and Lasix to increase sodium level. That doesnt make sense to me. Lasix inhibits sodium reabsorption in the kidney. Wherever sodium goes, water follows, hence the increase in urine output when taking Lasix... am I right?. This treatment didnt increase the sodium level. Am I looking at this wrong? Ive looked it up and Ive read that a diuretic such as Mannitol can increase serum sodium, but that lasix can actually CAUSE hyponatremia. I asked the doctor to explain this to me today and he was explaining exactly as I would, but he was interpreting that decreasing sodium reabsorption was keeping it in the blood. He just didnt make any sense at all. Wouldnt lasix decrease serum sodium?