<prompt> Acetazolamide acts atPCTDCTAscending loop of HenleDescending loop of Henle  <response>: Acetazolamide is a reversible inhibitor of the carbonic anhydrase enzyme that results in the reduction of hydrogen ion secretion at the renal tubule and increased renal excretion of sodium, potassium, bicarbonate, and water by inhibiting the enzyme CA 