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Chemical Structure| 72558-82-8 Chemical Structure| 72558-82-8

Structure of Ceftazidime
CAS No.: 72558-82-8

Chemical Structure| 72558-82-8

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Ceftazidime is a semisynthetic, broad-spectrum, third-generation cephalosporin β-lactam antibiotic used for the treatment of a number of bacterial infections.

Synonyms: GR20263

4.5 *For Research Use Only! Not for Human Use. We Do Not Sell to Patients.

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Product Citations

Product Citations

Kunz Coyne, Ashlan J ; Gray, Rachel ; Gonnabathula, Pavani ; May, Elizabeth S ; Tamma, Pranita D ; Do, Alex

Abstract: Members of the Stenotrophomonas maltophilia complex are intrinsically multidrug-resistant pathogens that disproportionately affect critically ill patients. Aztreonam–avibactam (ATM–AVI), FDA approved in 2025, combines (ATM; stable to L1 β-lactamase) with avibactam (AVI; an L2 inhibitor). plus ceftazidime–avibactam (ATM–CZA) has been used as a surrogate for ATM–AVI, but direct comparisons between the two regimens are lacking. Twenty-three clinical S. maltophilia complex isolates underwent broth microdilution (BMD) testing for ATM, , ATM–AVI, and ATM–CZA, with gradient diffusion performed in parallel for ATM–AVI and ATM–CZA. Static 24-h time-kill assays at humanized steady-state Cmax concentrations evaluated bactericidal activity (≥3-log₁₀ reduction). Semi-mechanistic pharmacodynamic modeling characterized growth kill dynamics by resistance determinants (blaL1, blaL2, smeABC). ATM–CZA and ATM–AVI MIC50/90 values for BMD were 1/2 and 2/4 mg/L, respectively. Both regimens were bactericidal against most isolates, with a mean paired difference of 0.09 log₁₀ colony-forming units (CFU)/mL (P = 0.83). Isolate-level variation was evident: ATM–AVI sustained killing, whereas ATM–CZA permitted regrowth for MD17639, −4.86 vs 0.13 log₁₀ CFU/mL, P = 0.019; MD17061, −2.61 vs 0.64 log₁₀ CFU/mL, P < 0.001). Conversely, ATM–CZA achieved greater reductions in MD17662 (−3.84 vs −1.95; P = 0.026), MD17047 (−4.27 vs −2.64; P = 0.021), and UK4 (−3.47 vs −1.58; P = 0.017). Modeling predicted ATM–AVI benefit in blaL2 and ATM–CZA benefit against blaL1 or smeABC dominant isolates, and diminished activity of both when mechanisms coexisted. ATM–AVI and ATM–CZA show comparable in vitro activity against S. maltophilia complex. Isolate-level heterogeneity warrants further study of genotype–phenotype relationships.

Keywords: Stenotrophomonas maltophilia complex ; aztreonam–avibactam ; ceftazidime–avibactam ; ; semi-mechanistic pharmacodynamic modeling

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Product Details of Ceftazidime

CAS No. :72558-82-8
Formula : C22H22N6O7S2
M.W : 546.58
SMILES Code : O=C1[C@@H](NC(/C(C2=CSC(N)=N2)=N\OC(C)(C(O)=O)C)=O)[C@@]3([H])SCC(C[N+]4=CC=CC=C4)=C(C([O-])=O)N13
Synonyms :
GR20263
English Name :(6R,7R)-7-((Z)-2-(2-Aminothiazol-4-yl)-2-(((2-carboxypropan-2-yl)oxy)imino)acetamido)-8-oxo-3-(pyridin-1-ium-1-ylmethyl)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate (contains ca. 10% Na2CO3)
MDL No. :MFCD00072034

Safety of Ceftazidime

Isoform Comparison

Biological Activity

Description
Ceftazidime (GR20263) is an antibiotic with broad-spectrum activity against both Gram-positive and Gram-negative aerobic bacteria. It shows effectiveness against Enterobacteriaceae, including β-lactamase-positive strains, and is resistant to hydrolysis by most β-lactamases[1].

Clinical Trial:

NCT Number Conditions Phases Recruitment Completion Date Locations
NCT01784445 Pancreatitis PHASE4 COMPLETED 2025-02-15 Clinical Hospital Centre, Rije... More >>ka, Kresimirova 42, 51000, Croatia Less <<

Protocol

Bio Calculators
Preparing Stock Solutions 1mg 5mg 10mg

1 mM

5 mM

10 mM

1.83mL

0.37mL

0.18mL

9.15mL

1.83mL

0.91mL

18.30mL

3.66mL

1.83mL

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