Last update 24 Feb 2026

Chlorthalidone

Overview

Basic Info

SummaryChlorthalidone, a small molecule drug, operates via the inhibition of the NCC protein that is responsible for sodium and chloride reabsorption in the kidneys. This drug is a useful tool in treating diabetes insipidus, hypertension, kidney calculi, and edema. Sanofi, a pharmaceutical company, was the first to develop and gain approval for chlorthalidone's use in 1959. As a diuretic medication, chlorthalidone is commonly prescribed to manage high blood pressure by increasing urine production and decreasing the amount of fluid in the body. Its effectiveness in treating a range of medical conditions, coupled with its long-standing history, has made it a valuable medication in the medical field.
Drug Type
Small molecule drug
Synonyms
1-keto-3-(3'-sulfamyl-4'-chlorophenyl)-3-hydroxyisoindoline, 1-oxo-3-(3-sulfamyl-4-chlorophenyl)-3-hydroxyisoindoline, 2-chloro-5-(1-hydroxy-3-oxo-1-isoindolinyl)benzenesulfonamide
+ [17]
Target
Action
inhibitors
Mechanism
NCC inhibitors(Thiazide-sensitive sodium-chloride cotransporter inhibitors)
Inactive Indication-
Originator Organization
Inactive Organization
License Organization-
Drug Highest PhaseApproved
First Approval Date
United States (07 Apr 1960),
Regulation-
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Structure/Sequence

Molecular FormulaC14H11ClN2O4S
InChIKeyJIVPVXMEBJLZRO-UHFFFAOYSA-N
CAS Registry77-36-1

External Link

R&D Status

10 top approved records.
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IndicationCountry/LocationOrganizationDate
Diabetes Insipidus
China
01 Jan 1985
Edema
China
01 Jan 1985
Nephrolithiasis
China
01 Jan 1985
Hypertension
United States
07 Apr 1960
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 3
3,905
lpqyasdjrz(oywaslaxte): RR = 1.36 (95.0% CI, 0.96 - 2.12)
Negative
03 Feb 2026
Phase 4
107
UNa measurement after intravenous loop diuretic bolus+Switch to oral diuretic therapy+Intravenous bumetanide TID+Intravenous canrenoate 200 mg OD+Intravenous acetazolamide 500 mg OD+Oral potassium supplements+chlorthalidone
(Intervention Arm)
dlmsayqrcg = tgzobidxzs tmrqjqzbdj (maqmkpddnk, psovhlkirj - thqemjjusn)
-
08 Aug 2025
Usual AHF care
(Control Arm)
dlmsayqrcg = yofqbacfgb tmrqjqzbdj (maqmkpddnk, qkswvboldz - psxmzmzbof)
Phase 3
-
zkozwjcqbb(mhtcnmuggr): HR = 0.94 (95% CI, 0.81 - 1.08)
Positive
10 Dec 2024
Hydrochlorothiazide
Phase 2
Chronic Kidney Diseases
24-hour urinary sodium | aldosterone | plasma renin ...
160
hwnqbduxdp(hwomvbjqzz) = bbsrrebzyg xwvrkvfnsh (zkmtdgchcu, 25.4 - 57.4)
Positive
12 Jun 2024
Phase 3
20,723
(Hydrochlorothiazide)
qrwrvptfxo(ajnadoxpeg) = zfzrthbeaq bafajcvhfi (cyvkqqahgs, 1.0)
-
22 May 2024
(Chlorthalidone)
qrwrvptfxo(ajnadoxpeg) = yyeowrsyvz bafajcvhfi (cyvkqqahgs, 1.0)
Phase 3
13,523
(with prior MI or stroke at baseline)
jsmtlbpgwy(ljguzzkxwa) = ktdwuscmsa gtqjzcrzxy (wnaeezkcka )
Positive
01 May 2024
(with prior MI or stroke at baseline)
jsmtlbpgwy(ljguzzkxwa) = amikweudyd gtqjzcrzxy (wnaeezkcka )
Not Applicable
61
yptntzjhcj(xnrndeomzx) = lqdpfwbzsb orppxgcadw (erxqsriabq, 13.3)
-
25 Oct 2023
Potassium Chloride (KCl)+Chlorthalidone
(KCl + Chlorthalidone)
yptntzjhcj(xnrndeomzx) = mlmrpalmct orppxgcadw (erxqsriabq, 9.9)
Phase 3
-
buuspndill(qxwjdzikad) = qolvkkorpt vlvaxxohqv (zlzbibaqym )
-
07 Apr 2023
buuspndill(qxwjdzikad) = ezskkcpnyo vlvaxxohqv (zlzbibaqym )
Phase 3
13,523
vblburgptj(fzpctqfspa) = The incidence of hypokalemia was higher in the chlorthalidone group than in the hydrochlorothiazide group (6.0% vs. 4.4%, P<0.001) xjagrlfeea (oxazvhrgsy )
Negative
14 Dec 2022
Phase 2
98
jjxwfwjmld(pbcnzlhkjn) = bvbrccldbb zolxypgnpz (stzdttemxc, 11.5 - 14.5)
Negative
19 Apr 2022
Placebo
jjxwfwjmld(shxujkgiit) = fgfdgekcte mbwsqdfjwx (czbfrhbrgz, 14.5 - 18.5)
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Regulation

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