[Pharmacology of potassium-sparing diuretics]

Potassium sparing diuretics in combination with thiazides represent a therapeutical enrichment if applied correctly that is with respect to contraindications, interactions (especially with ACE-inhibitors and AT1-antagonists) and to pharmacokinetic properties. Triamterene has to be administered twice a day while amiloride and spironolactone are effective for 24 hours. Of course, pharmacokinetic parameters of potassium sparing diuretics have to be considered also in fixed combinations.