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≥99%, powder

N-(5-[Aminosulfonyl]-1,3,4-thiadiazol-2-yl)acetamide, N-(5-Sulfamoyl-1,3,4-thiadiazol-2-yl)acetamide, 5-Acetamido-1,3,4-thiadiazole-2-sulfonamide
Empirical Formula (Hill Notation):
CAS Number:
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EC Number:
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PubChem Substance ID:

Quality Level

biological source









258-259 °C


1 M NH4OH: 50 mg/mL
DMSO: soluble
methanol and ethanol: slightly soluble

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Acetazolamide has been used:
  • to study its protective effect on steatotic liver grafts against cold ischemia reperfusion injury{49)
  • to determine its ability to bind isolated porcine retinal pigment epithelium (RPE) melanin by cassette dosing and rapid equilibrium dialysis inserts
  • to validate the in vitro gastrulation model of P19C5 stem cells for developmental toxicity screening assays
  • to study its inhibitory effect on melanogenesis through enzyme kinetic, in vitro, in vivo and in silico analyses in zebrafish and in A375 human melanoma cells

Carbonic anhydrase inhibitor; increases cerebral blood flow.

Biochem/physiol Actions

Acetazolamide is a member of sulfonamide drug family. It as an ability to inhibit the activity of carbonic anhydrase. It rapidly increases cerebral blood flow (CBF) and is used as an investigative tool in CBF studies. Acetazolamide acts as a therapeutic agent for epilepsy, glaucoma and pseudotumor cerebri.
Inhibits water permeability of membranes by interacting with aquaporins

Other Notes

Tandem Mass Spectrometry data independently generated by Scripps Center for Metabolomics is available to view or download in PDF. A6011.pdf Tested metabolites are featured on Scripps Center for Metabolomics METLIN Metabolite Database. To learn more, visit


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Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2

Storage Class Code

11 - Combustible Solids

WGK Germany


Flash Point F

Not applicable

Flash Point C

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Acetazolamide inhibits the level of tyrosinase and melanin: an enzyme kinetic, in vitro, in vivo, and in silico studies
Abbas Q, et al.
Chemistry and Biodiversity, 14(9), e1700117-e1700117 (2017)
Gianfranco Bazzu et al.
Analytical chemistry, 81(6), 2235-2241 (2009-02-19)
A miniaturized biotelemetric device for the amperometric detection of brain tissue oxygen is presented. The new system, derived from a previous design, has been coupled with a carbon microsensor for the real-time detection of dissolved O(2) in the striatum of...
Maria Skytte Torring et al.
Investigative ophthalmology & visual science, 50(1), 345-351 (2008-09-02)
Carbonic anhydrase inhibitors reduce intraocular pressure, which may protect the optic nerve from ischemia. However, carbonic anhydrase inhibitors have also been shown to dilate the blood vessels in the retina and the optic nerve head. The purpose of the present...
Lorenzo Biancalana et al.
Dalton transactions (Cambridge, England : 2003), 47(28), 9367-9384 (2018-06-29)
The carbonic anhydrase inhibitor acetazolamide (AcmH2) reacted with [(η6-p-cymene)RuCl(μ-Cl)]2 to afford [(η6-p-cymene)RuCl2(κN-AcmH2)], 1A, in near-quantitative yield. In methanol, 1A exists in equilibrium with 1B, being probably a coordination isomer, as established by VT 1H-EXSY NMR spectroscopy. DFT calculations pointed to...
Effect of acetazolamide on cerebral blood flow and cerebral metabolic rate for oxygen.
Vorstrup S, et al.
The Journal of Clinical Investigation, 74(5), 1634-1639 (1984)

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