NCIt definition : A synthetic pyrazine derivative with antikaliuretic and diuretic properties. Amiloride
inhibits sodium channels located in the distal tubules and collecting ducts of the
kidney, thereby preventing the absorption of sodium and increasing its excretion along
with water, to produce naturesis. In response to the hypernatremic conditions in the
kidney, the plasma membrane becomes hyperpolarized and electrochemical forces are
reduced, which then prevents the excretion of potassium and hydrogen into the lumen.;