Aztreonam

C. diff Risk

Medium

Oral Bioavailability

NA

Approximate Cost

$160/day

Spectrum Of Activity

Dosing

Renally cleared, requires dosage adjustment with changes in renal function. Consult a pharmacist for renal dosing.

Cystic Fibrosis: IV 150 to 200 mg/kg/DAY divided q6-8 hours. Max dose: 8 g/DAY

IV, IM 90 to 120 mg/kg/DAY divided every 6-8 hours.

General Information

Common Usage

Therapy of gram negative infections including Pseudomonas, particularly in patients with penicillin and cephalosporin allergy or when there is no alternative susceptible agent.

Nebulized form used in cystic fibrosis patients.

Drug Monitoring

Renal and liver function, CBC

Adverse Effects

Elevated liver enzymes, cytopenias, eosinophilia, phlebitis at injection site, rash/allergy, CNS toxicity, hypotension, seizures, increased SCr

Additional Information

Use with caution in patients with congenital or acquired arginase deficiency or other conditions where tolerance to L-Arginine may be limited.

Pharmacology

Antimicrobial class: Monobactam

Average serum half life: Neonates:

  • <7 days, ≤2.5 kg: 5.5 to 9.9 hours

  • <7 days, >2.5 kg: 2.6 hours

  • 1 week to 1 month: 2.4 hours

  • Children 2 months to 12 years: 1.7 hours

  • Children with cystic fibrosis: 1.3 hours

Route of Elimination: 60% to 70% excreted unchanged in the urine by active tubular secretion and glomerular filtration; 12% excreted in feces