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RX BIN: 015558
RX PCN: HT
Group ID: DDN6600
Card Holder ID: DDN6600

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Doripenem volume of distribution

The average Vd is 16.8 L (8.09-55.5 L) at steady-state in healthy subjects. Doripenem penetrates into many tissues and fluids, including potential sites of approved indication infections.

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What is Doripenem

Doripenem is a broad-spectrum, carbapenem antibiotic marketed under the brand name Doribax by Janssen. Doripenem injection was approved by the FDA in 2007 to treat complicated urinary tract and intra-abdominal infections. In a clinical trial of doripenem treatment in ventilator associated pneumonia (vs. imipenem and cilastatin), it was found that doripenem carried an increased risk of death and lower clinical cure rates, resulting in a premature termination of the trial. The FDA revised the doripenem label in 2014 to include a warning against use in ventilator-associated pneumonia and to reiterate its safety and efficacy for its approved indications.

Doripenem mechanism of action

Doripenem is a broad-spectrum carbapenem antibiotic with activity against many gram-positive and gram-negative aerobic bacteria, as well as a variety of anaerobes. Like other beta-lactam antibiotics, doripenem’s bactericidal mechanism of action is mostly due to cell death after inhibition of bacterial enzymes called penicillin-bindng proteins (PBPs), which are responsible for peptidoglycan cross-linking during the synthesis of the bacterial cell wall. Carbapenems mainly have high affinity for PBPs 1a, 1b, 2 and 3. Inhibition of each PBP usually results in a different inactivating mechanism. Inhibition of PBPs 1a and 1b results in fast bacterial killing through the formation of spheroplasts, inhibition of PBP 2 results in rod-shaped bacteria to become spherical, and inhibition of PBP 3 results in filamentous-shaped organisms. The PBPs preferentially bound by different carbapenems depend on the organism. In E.coli and P.aeruginosa, doripenem binds to PBP 2, which is involved in the maintenance of cell shape, as well as to PBPs 3 and 4. Doripenem has a 1-beta-methyl side chain, which allows it to be relatively resistant to dehydropeptidase, as well as a trans-alpha-1-hydroxyethyl group at position 6 which provides beta-lactamase resistance. Like other carbapenems, doripenem is different from most beta-lactams due to its stability against hydrolysis by most beta-lactamases, including penicillinases, cephalosporinases, ESBL, and Amp-C producing enterobacteriaceae.

Dosage forms of Doripenem

FormRouteStrength
Powder for solutionintravenous500 mg
Powder for solution for infusionIntravenous use250 mg
Powder for solution for infusionIntravenous use500 mg
Prescription Generics

false

International Brands

Doribax

Synonyms

Manufacturers

Janssen Inc

CAS number

UNII

BHV525JOBH

State

solid

Affected organisms

Various aerobic and anaerobic microorganisms

Indication of Doripenem

Doripenem is indicated in the treatment of complicated intra-abdominal infections and complicated urinary tract infections, including pyelonephritis, caused by designated susceptible bacteria.

Toxicity of Doripenem

Dosage adjustment is necessary in patients with moderate and severe renal impairment. Doripenem’s FDA label includes a warning against use in ventilator-associated bacterial pneumonia, as a clinical trial for that indication resulted in increased mortality with doripenem (23% vs. 16.7% recieving imipenem) as well as lower clinical response rates. Seizures have been reported with doripenem treatment; patients at greater risk of developing seizures we found to have pre-existing central nervous system (CNS) conditions, compromised renal function, or patients receiving higher doses than 500 mg every 8 hours. Doripenem also reduces plasma levels of valproic acid when administered concomitantly; therefore patients with pre-existing seizure disorders on valproic acid are at even higher risk of breakthrough seizures if receiving both drugs at the same time. Doripenem is considered pregnancy category B as it was not found to be teratogenic or produce effects on ossification, developmental delays, or fetal weight in rat and rabbit studies. There are no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. It is not known whether doripenem is excreted into breast milk, therefore caution should be exercised with doripenem administration to nursing women.

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