Chemical Component Summary

FormulaC12 H11 N7
Molecular Weight253.26
Isomeric SMILESNc1nc(N)c2nc(c(N)nc2n1)-c1ccccc1

Chemical Details

Formal Charge0
Atom Count30
Chiral Atom Count0
Chiral Atomsn/a
Bond Count32
Aromatic Bond Count18
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00384 Different stereochemistry
DescriptionA pteridine that is used as a mild diuretic. [PubChem]
  • 6-phenylpteridine-2,4,7-triamine
  • Dyrenium
  • Teridin
  • Triamteren
  • Triamtérène
Brand Names
  • Apo Triazide
  • Dyazide
  • Dyazide Tab
  • Dyrenium
  • Dyrenium 100
Affected OrganismHumans and other mammals
IndicationFor the treatment of edema associated with congestive heart failure, cirrhosis of the liver, and the nephrotic syndrome; also in steroid-induced edema, idiopathic edema, and edema due to secondary hyperaldosteronism.
PharmacologyTriamterene, a relatively weak, potassium-sparing diuretic and antihypertensive, is used in the management of hypokalemia. Triamterene is similar in action to amiloride but, unlike amiloride, increases the urinary excretion of magnesium.
Mechanism of actionTriamterene inhibits the epithelial sodium channels on principal cells in the late distal convoluted tubule and collecting tubule, which are responsible for 1-2% of total sodium reabsorption. As sodium reabsorption is inhibited, this increases the osmolarity in the nephron lumen and decreases the osmolarity of the interstitium. Since sodium concentration is the main driving force for water reabsorption, triamterene can achieve a modest amount of diuresis by decreasing the osmotic gradient necessary for water reabsorption from lumen to interstitium. Triamterene also has a potassium-sparing effect. Normally, the process of potassium excretion is driven by the electrochemical gradient produced by sodium reabsorption. As sodium is reabsorbed, it leaves a negative potential in the lumen, while producing a positive potential in the principal cell. This potential promotes potassium excretion through apical potassium channels. By inhibiting sodium reabsorption, triamterene also inhibits potassium excretion.
Route of administrationOral
  • Cardiovascular Agents
  • Cardiovascular System
  • Chemical Actions and Uses
  • Cytochrome P-450 CYP1A2 Inhibitors
  • Cytochrome P-450 CYP1A2 Substrates
CAS number396-01-0
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682