Cefadroxil

Cefadroxil Basic information
Product Name:Cefadroxil
Synonyms:(6R,7R)-7-[(R)-2-AMINO-2-(4-HYDROXY-PHENYL)-ACETYLAMINO]-3-METHYL-8-OXO-5-THIA-1-AZA-BICYCLO[4.2.0]OCT-2-ENE-2-CARBOXYLIC ACID;CEFAMOX;CEFADROXIL;CEFADROXIL MONOHYDRATE;Cefradroxil;P-HYDROXYCEPHALEXINE;monohydrate,(6r-(6-alpha,7-beta(r*)))-l)acetyl)amino)-3-methyl-8-oxo;(6R,7R)-7-[[(2R)-Amino-(4-hydroxyphenyl)acetyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid Monohydrate
CAS:66592-87-8
MF:C16H17N3O5S.H2O
MW:381.41
EINECS:629-747-6
Product Categories:Intermediates & Fine Chemicals;Pharmaceuticals;Sulfur & Selenium Compounds;DURICEF
Mol File:66592-87-8.mol
Cefadroxil Structure
Cefadroxil Chemical Properties
Melting point 197 °C
storage temp. Keep in dark place,Inert atmosphere,2-8°C
solubility Slightly soluble in water, very slightly soluble in ethanol (96 per cen
pkapKa 1.38(H2O t=20±2 N2atmosphere) (Uncertain); 7.35(H2O t=20±2 N2atmosphere) (Uncertain);10.10(H2O t=20±2 N2atmosphere) (Uncertain)
form neat
color White to Off-White
BCS Class3
InChIKeyNBFNMSULHIODTC-CYJZLJNKSA-N
CAS DataBase Reference66592-87-8(CAS DataBase Reference)
Safety Information
Hazard Codes Xn,Xi
Risk Statements 36/37/38-42/43
Safety Statements 26-36-36/37
WGK Germany 2
RTECS XI0337000
HS Code 2941906000
Cefadroxil Usage And Synthesis
DescriptionCefadroxil has an amoxicillin-like side chain at C-7 and is orally active. There are some indications that cefadroxil has some immunostimulant properties mediated through T-cell activation and that this is of material assistance to patients in fighting infections. The prolonged biological half-life of cefadroxil allows once-a-day dosage.
Chemical PropertiesWhite Crystalline Solid. Soluble in chloroform, miscible with ethanol and ether, insoluble in water, and will change color when exposed to light or for a long time.
UsesCefadroxil Monohydrate is a semi-synthetic cephalosporin antibacterial. It has been used for various community-acquired infections for which oral cephalosporins are appropriate.
DefinitionChEBI: The hydrate that is the monohydrate of the cephalosporin cefadroxil.
Brand nameDuricef (Bristol-Myers Squibb); Ultracef (Bristol Labs).
Antimicrobial activityResembles closely that of cefalexin
General DescriptionCefadroxil is a semisynthetic first-generation β-lactam cephalosporin antibiotic derived from cefalexin with antibacterial activity. It is used to treat urinary tract infections, skin and skin structure infections, pharyngitis, and tonsillitis caused by susceptible bacteria.
PharmacologyCefadroxil has a broad spectrum of antimicrobial action; it is active with respect to Grampositive and Gram-negative microorganisms. Like all of the other drugs described above, it acts as a bactericide by disrupting the process of restoring the membranes of bacteria. Synonyms of this drug are bidocef, cefadril, duracef, ultracef, and others.
PharmacokineticsOral absorption: >90%
Cmax 250 mg oral: c. 9 mg/L after 1.2 h
500 mg oral: c. 18 mg/L after 1.2 h
Plasma half-life: 1–1.5 h
Plasma protein binding : 20%
Absorption is little affected by administration with food. Distribution is similar to that of cefalexin. It is eliminated unchanged by glomerular filtration and tubular secretion; 90% of the dose appears in the urine over 24 h, most in the first 6 h, producing concentrations exceeding 500 mg/L.




Clinical UseCefadroxil (Duricef) is an orally active semisyntheticderivative of 7-ADCA, in which the 7-acyl group is the Dhydroxylphenylglycylmoiety. This compound is absorbedwell after oral administration to give plasma levels that reach75% to 80% of those of an equal dose of its close structuralanalog cephalexin. The main advantage claimed for cefadroxilis its somewhat prolonged duration of action, whichpermits once-a-day dosing. The prolonged duration of actionof this compound is related to relatively slow urinary excretionof the drug compared with other cephalosporins, butthe basis for this remains to be explained completely. Theantibacterial spectrum of action and therapeutic indications ofcefadroxil are very similar to those of cephalexin and cephradine.The D-p-hydroxyphenylglycyl isomer is much moreactive than the L-isomer.
Side effectsSide effects described are those common to oral cephalosporins.
SynthesisCefadroxil, [6R-[6|á,7|?(R)]]-3-methyl-8-oxo-7-[[amino(4-hydroxyphenyl) acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-en-2-carboxylic acid (32.1.2.14), is an analog of cephalexin and differs only in the presence of a hydroxyl group in the fourth position of the phenyl ring of phenylglycine, and is synthesized by a scheme analogous to the scheme of cephradin synthesis.

Synthesis_66592-87-8

Veterinary Drugs and TreatmentsCefadroxil is approved for oral therapy in treating susceptible infections of the skin, soft tissue, and genitourinary tract in dogs and cats. The veterinary oral tablets have been discontinued (in the USA), but human-labeled oral capsules and tablets are still available.
in vitrothe inhibitory activity of this compound was similar to that of cephalexin and cephradine when tested against 602 clinical isolates on mueller-hinton medium. in the oral treatment of experimental infections of mice, cefadroxil was more effective than cephalexin against streptococcus pyogenes, and comparably effective against streptococcus pneumoniae, staphylococcus aureus, and several gram-negative species [1].
in vivoin mice, oral administration of cefadroxil at doses ranging from 25 to 100 mg/kg attained peak concentrations in the blood. higher peak levels were noted with cefadroxil than with cephalexin at a dose of 200 mg/kg [1].
Drug interactionsPotentially hazardous interactions with other drugs
Anticoagulants: effects of coumarins may be enhanced.
MetabolismMore than 90% of a dose of cefadroxil may be excreted unchanged in the urine within 24 hours by glomerular filtration and tubular secretion.
references[1] buck r e, price k e. cefadroxil, a new broad-spectrum cephalosporin[j]. antimicrobial agents and chemotherapy, 1977, 11(2): 324-330.
[2] gerber m a, randolph m f, chanatry j, et al. once daily therapy for streptococcal pharyngitis with cefadroxil[j]. the journal of pediatrics, 1986, 109(3): 531-537.
Cefadroxil Preparation Products And Raw materials
Methylparaben Methyl Cephalexin Acetaminophen Aminopyrine Acetylacetone Bensulfuron methyl Glucosamine Methyl cellulose Phenylacetone EC 2.6.1.2 Cefadroxil-d4 (major),Cefadroxil-D4 Cefadroxil Acetyl chloride Cefadroxil Capsule Sulfamic acid Methyl acrylate Methyl bromide

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