Hydrochlorothiazide

CAS Number
58-93-5
EC Number
200-403-3
Chemical Formula
C7H8ClN3O4S2
Molecular Weight
297.7 g/mol
Abbreviation
HCTZ

Description

Hydrochlorothiazide (CAS 58-93-5), commonly abbreviated as HCTZ, is a thiazide diuretic active pharmaceutical ingredient used in the treatment of hypertension and edema. It is one of the most established antihypertensive APIs in global pharmaceutical manufacturing, appearing in both standalone formulations and fixed-dose combinations.

HCTZ is a primary active ingredient in oral solid dosage forms, such as tablets and capsules, targeting cardiovascular and renal indications for patients worldwide. Fixed-dose combination products pairing HCTZ with ACE inhibitors, ARBs, or beta-blockers represent a major share of its commercial demand in the pharmaceutical sector.

Generic pharmaceutical manufacturers source it as a finished API for direct compression or wet granulation processes to ensure efficient production cycles. Contract formulators also use it as a reference standard component in bioequivalence and analytical method development for various regulatory submission requirements.

Hydrochlorothiazide is supplied as a white to off-white crystalline powder. It is available in USP, BP, and Ph. Eur. compendial grades to meet global standards. Micronized grades are available where particle size control is critical to dissolution performance and content uniformity in finished dosage forms for high-quality manufacturing.

Other Names (Synonyms)

chlorsulfonamidodihydrobenzothiadiazine dioxide|6-chloro-1,1-dioxo-3,4-dihydro-2H-1λ6,2,4-benzothiadiazine-7-sulfonamide|3,4-dihydrochlorothiazide|Esidrix|HCTZ|Vetidrex|2H-1,2,4-Benzothiadiazine-7-sulfonamide, 6-chloro-3,4-dihydro-, 1,1-dioxide|Su 5879

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

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Physical Properties

Melting Point 273-275 °C
Boiling Point 577.0±60.0 °C(Predicted)
Density 1.512 g/cm³ (Liquid)
Flash Point 9°C
Appearance White Solid
Color White to Off-White
Odor wh. or pract. wh. cryst. powd., odorless
Form solid
Water Solubility 722mg/L(25 ºC)
Refractive Index 1.6100 (estimate)
Log P -0.070

Documentation

Safety & Handling Learn More

Danger
GHS07· Irritant GHS08· Health Hazard

Hazard Statements

H302 Harmful if swallowed
H317 May cause an allergic skin reaction
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
H372 Causes damage to organs through prolonged or repeated exposure

Precautionary Statements

P233 Keep container tightly closed.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.

Trade & Regulatory

HS Code 29350090
UN Number 1230
ADR Class 3
Packing Group II
Storage Class 11 - Combustible Solids
WGK (Germany) 2
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