Cloxacillin sodium salt monohydrate

β-lactamase-resistant antibiotic

Linear Formula:
C19H17ClN3O5SNa · H2O
CAS Number:
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Quality Level



Mode of action

cell wall synthesis | interferes

antibiotic activity spectrum

Gram-positive bacteria

storage temp.


SMILES string




InChI key


Related Categories

General description

Chemical structure: ß-lactam


Cloxacillin is effective against infections caused by penicillin G-resistant staphylococci. It was used in studies of topical antibacterial agents for burn and crush wounds.

Biochem/physiol Actions

Cloxacillin is a semi-synthetic antibiotic and a chlorinated derivative of oxacillin. It inhibits the last stage of bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), which results in cell lysis. Cell lysis is mediated by bacterial cell wall autolytic enzymes. Cloxacillin is often used as AmpC β-lactamase inhibitor in combination with β-lactam antibiotics.

Other Notes

Keep container tightly closed in a dry and well-ventilated place.


Exclamation markHealth hazard




Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - Skin Sens. 1 - STOT SE 3

Target Organs

Respiratory system


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

Methenamine salts as topical antibacterial agent. I. Experimental studies for burn and crush wound.
T Matsumoto et al.
Archives of surgery (Chicago, Ill. : 1960), 101(1), 71-77 (1970-07-01)
A New Antibacterial Agent: Sodium Cloxacillin Monohydrate (Tegopen)
Journal of the American Medical Association, 195, 569-570 (1966)
Shih-Ping Lin et al.
Journal of microbiology, immunology, and infection = Wei mian yu gan ran za zhi, 45(3), 200-207 (2012-01-03)
A growing number of β-lactamases have been reported in Pseudomonas aeruginosa isolates. The aims of this study were to survey the types of extended-spectrum β-lactamases (ESBLs) by polymerase chain reaction (PCR), to evaluate the reliability of phenotypic tests for ESBLs...
Jadupati Malakar et al.
International journal of biological macromolecules, 50(1), 138-147 (2011-10-25)
This work investigates the development, optimization and in vitro evaluation of liquid paraffin-entrapped multiple-unit alginate-based floating system containing cloxacillin by emulsion-gelation method for gastro retentive delivery. The effect of process variables like drug to polymer ratio by weight, and liquid...
C Garrigós et al.
Antimicrobial agents and chemotherapy, 56(7), 3806-3811 (2012-05-16)
Despite the use of daptomycin alone at high doses (greater than 6 mg/kg of body weight/day) against difficult-to-treat infections, clinical failures and resistance appeared. Recently, the combination daptomycin-cloxacillin showed enhanced efficacy in clearing bacteremia caused by methicillin-resistant Staphylococcus aureus (MRSA)....

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