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Systematic (IUPAC) name
6-chloro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
CAS number 58-94-6
ATC code C03AA04
PubChem 2720
DrugBank APRD00721
Chemical data
Formula C7H6ClN3O4S2 
Mol. mass 295.725 g/mol
Pharmacokinetic data
Bioavailability  ?
Metabolism Nil
Half life 45 to 120 minutes
Excretion Renal
Therapeutic considerations
Pregnancy cat.


Legal status


Routes Oral

Chlorothiazide sodium (Diuril) is a diuretic used within the hospital setting or for personal use to manage excess fluid associated with congestive heart failure. It is also used as an antihypertensive.

Most often taken in pill form, it is usually taken orally once or twice a day. In the ICU setting, chlorothiazide is given to diurese a patient in addition to furosemide (Lasix). Working in a separate mechanism than furosemide, and absorbed enterically as a reconstituted suspension administered through a nasogastric tube (NG tube), the two drugs potentiate one another without risk of toxicity. Because it is absorbed enterically there are no risks associated with chlorothiazide as there are with furosemide administration.



  • Large amount of excess fluid including:
    • Diagnosed congested heart failure
    • Peripheral edema
    • Rales / Rhonchi
    • Hypertension


  • Renal failure or insufficency
  • Allergies to sulfa drugs


  • 500 mg–1 g once or twice a day, by mouth or through NG tube (reconstituted suspension)
  • May also be given intravenously, and should be given first if given in combination with IV lasix since it potentiate's the diuretic effect of furosemide.

Side effects

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chlorothiazide". A list of authors is available in Wikipedia.
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