Ticarcillin* Class

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Ticarcillin* Class: β-lactam Overview Ticarcillin is one of the carboxypenicillins, a semisynthetic group of β-lactams. These carboxypenicillins, like ureidopenicillins, were developed for effectiveness against enterobacteriaceae (Klebsiella species, Proteus species, Enterobacter species and Pseudomonas aeruginosa). Carbenicillin was developed by adding a carboxyl group to the penicillin molecule. Ticarcillin was developed by adding additional substitutions to the carbenicillin carboxyl group. Ticarcillin exhibits greater antipseudomonal activity than carbenicillin. Ticarcillin is not acid-stable, therefore the drug is administered parenterally. Resistance Primary mechanisms of resistance against ticarcillin and other β-lactams are production of β-lactamases and alteration of penicillin binding proteins. Decreased permeability through the bacterial cell wall is another mechanism of resistance. Recent epidemiologic surveillance indicates that up to 50% of Pseudomonas aeruginosa isolates are resistant to ticarcillin. Effectiveness Ticarcillin was developed for increased effectiveness against Gram-negative bacteria, like Klebsiella species, Proteus species, Enterobacter species and especially Pseudomonas aeruginos. In fact, ticarcillin is often referred to as an anti-pseudomonal penicillin. This increased effectiveness against Gram-negative organisms is balanced by decreased effectiveness against Gram-positive organisms. These antibacterials can be combined with β-lactamase inhibitors to increase the spectrum of effectiveness against β- lactamase–producing bacteria, such as H influenzae, M catarrhalis, Staphylococcus species, Neisseria gonorrhoeae, Escherichia coli, Klebsiella pneumoniae, Proteus species, Bacteroides fragilis group, Fusobacterium species, Prevotella species and Porphyromonas species. In human medicine, ticarcillin/clavulanate combinations are used in the treatment of infected animal bite wounds and aspiration pneumonia. Ticarcillin is also used in infections caused by Pseudomonas aeruginosa, including osteomyelitis, and abdominal infections. See the penicillin section for an explanation of uptake in body fluids and CSF. *References available by request. Call the Infectious Disease Epidemiology Section, Office of Public Health, Louisiana Department of Health and Hospitals (504-219-4563) .

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