Acetazolamide: Effects on ion conc

Advanced, Clinical Subspecialties

Acetazolamide is a carbonic anhydrase inhibitor that results in a metabolic acidosis. Metabolic acidosis triggers an increased respiratory drive with decreased pCO2 in order to compensate for decreased in [HCO3-].  

Acetazolamide reduces hydrogen ion secretion and increases the excretion of bicarbonate, sodium, potassium and water at the renal tubule. Therefore, it creates a decrease in the serum concentration of potassium and sodium. Due to the reduction in sodium concentration without a concomitant reduction in the chloride concentration, the strong ion difference (SID = ([Na+] + [K+] + [Ca2+] + [MG2+]) – ([CL-] + [Lactate]) ) is reduced.


Answered correctly


Year asked

Lauren Powlovich, MD