18 results
Thiazide
diuretics
Carbonic anhydrase
inhibitors
(e.g., acetazolamide)
Nat-Cl symport
Na and HCO;-
reabsorption
Aldosterone
antagonists
(e.g., spironolactone)
Nat channel
(indirect effect)
Loop diuretics (e.g., furosemide)
Amiloride,
#triamterene
Nat-K+-2CF symport
Na channel
(direct effect)
#NaCI reabsorption
Amiloride, #triamterene
Mechanism of Action of Diuretics
Amiloride, Triamterene, Spironolactone
Loop Diuretics
Thiazides
Acetazolamide

#Diuretics #Mechanism #Action #pharmacology #pathophysiology #nephrology
Diuretics Amiloride, Triamterene
Diuretics sites of action on the nephron
1) Acetazolamide (carbonic anhydrase inhibitor)
2) Osmotic diuretics (e.g. mannitol)
3) Loop
spironolactone, triamterene
Drugs causing hyperkalemia
 • Impaired release of renin: NSAIDs, Beta blockers, Cyclosporine, tacrolimus, Diabetes, Elderly
 •
Channel Blockers: Triamterene
Drugs that Impair Renal Potassium Excretion 

Decreased ENaC channel function: Amiloride, Triamterene, Pentamidine
Decreased Aldosterone Synthesis: Heparin,
function: Amiloride, Triamterene
Summary of Diuretic Agents 
Subclass, Drug, Mechanism of Action, Effects, Clinical Applications, Pharmacokinetics, Toxicities, Interaction
CARBONIC ANHYDRASE
Eplerenone • Triamterene
Mechanisms of Drug-Induced Hyperkalemia 
 • Direct renin inhibitor (Aliskiren)
 • Renin release inhibition (NSAIDs, Beta-Blockers)
blockers (Amiloride, Triamterene
The Diagnostic Approach to Hyperkalemia
Drugs
 - Amiloride
 - Spironolactone
 - Triamterene
 - Trimethoprim
 - Pentamidine
 -
Spironolactone - Triamterene
Renal Tubular Acidosis - Differential Diagnosis Algorithm
Decreased Serum K, Urine pH < 5.5 - Proximal RTA
Decreased
ENaC: Amiloride, Triamterene
Distal Renal Tubular Acidosis
Distal RTA is the true Nephrogenic RTA and can be truly divided into
Amiloride and Triamterene