Cyclopenthiazide

CAS NO.：742-20-1
Empirical Formula: C13H18ClN3O4S2
Molecular Weight: 379.88
MDL number: MFCD00865825
EINECS: 212-012-5
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-27 23:24:57

What is Cyclopenthiazide?

The Uses of Cyclopenthiazide

Cyclopenthiazide is a thiazide diuretic. Cyclopenthiazide is used in the treatment of oedema caused by conditions such as kidney disease, liver cirrhosis and pre-menstrual syndrome as well as in the treatment of hypertension.

The Uses of Cyclopenthiazide

Antihypertensive;Sodium Chloride Symporter Inhibitor

Background

Cyclopenthiazide is a thiazide diuretic with antihypertensive properties. In a double blind, randomized crossover study, cyclopenthiazide was effective in reducing diastolic blood pressure in mildly hypertensive non-insulin dependent diabetic patients . It is a positive allosteric modulator at AMPA-A receptors .

Definition

ChEBI: 6-chloro-3-(cyclopentylmethyl)-1,1-dioxo-3,4-dihydro-2H-1$l^{6},2,4-benzothiadiazine-7-sulfonamide is a benzothiadiazine.

World Health Organization (WHO)

Cyclopenthiazide, a thiazide diuretic, was introduced in 1968. It continues to be used mainly in combination drugs.

Clinical Use

Thiazide diuretic:
Hypertension

Heart failure

Oedema

Drug interactions

Potentially hazardous interactions with other drugs
Analgesics: increased risk of nephrotoxicity with NSAIDs; antagonism of diuretic effect. Anti-arrhythmics: hypokalaemia leads to increased cardiac toxicity; effects of lidocaine and mexiletine antagonised.
Antibacterials: avoid administration with lymecycline.
Antidepressants: increased risk of hypokalaemia with reboxetine; enhanced hypotensive effect with MAOIs; increased risk of postural hypotension with tricyclics.
Antiepileptics: increased risk of hyponatraemia with carbamazepine.
Antifungals: increased risk of hypokalaemia with amphotericin.
Antihypertensives: enhanced hypotensive effect; increased risk of first dose hypotension with postsynaptic alpha-blockers like prazosin; hypokalaemia increases risk of ventricular arrhythmias with sotalol.
Antipsychotics: hypokalaemia increases risk of ventricular arrhythmias with amisulpride; enhanced hypotensive effect with phenothiazines; hypokalaemia increases risk of ventricular arrhythmias with pimozide - avoid.
Atomoxetine: hypokalaemia increases risk of ventricular arrhythmias.
Cardiac glycosides: increased toxicity if hypokalaemia occurs.
Ciclosporin: increased risk of nephrotoxicity and possibly hypomagnesaemia.
Cytotoxics: increased risk of ventricular arrhythmias due to hypokalaemia with arsenic trioxide; increased risk of nephrotoxicity and ototoxicity with platinum compounds.
Lithium: excretion reduced, increased toxicity

Metabolism

Not Available

Metabolism

Cyclopenthiazide appears to be entirely excreted unchanged in the urine.

Properties of Cyclopenthiazide

Melting point:	230°
Boiling point:	605.6±65.0 °C(Predicted)
Density	1.3650 (rough estimate)
refractive index	1.6100 (estimate)
storage temp.	Refrigerator
solubility	Acetonitrile (Slightly), DMSO (Slightly), Methanol (Sparingly)
form	Solid
pka	9.00±0.40(Predicted)
color	White to Off-White
Water Solubility	50mg/L(room temperature)
CAS DataBase Reference	742-20-1(CAS DataBase Reference)
EPA Substance Registry System	2H-1,2,4-Benzothiadiazine-7-sulfonamide, 6-chloro-3-(cyclopentylmethyl)-3,4-dihydro-, 1,1-dioxide (742-20-1)

Safety information for Cyclopenthiazide

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07 Health Hazard GHS08
GHS Hazard Statements	H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation H373:Specific target organ toxicity, repeated exposure
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.