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Wiktionary
aztreonam

n. A synthetic monobactam originally isolated from ''Chromobacterium violaceum'', similar in action to penicillin.

WordNet
aztreonam

n. an antibiotic (trade name Azactam) used against severe infections; has minimal side effects [syn: Azactam]

Wikipedia
Aztreonam

Aztreonam (trade names Azactam injection, Cayston inhalation) is a monobactam antibiotic used primarily to treat infections caused by gram-negative bacteria. It is a synthetic drug based on a simpler monobactam isolated from Chromobacterium violaceum. It is resistant to some beta-lactamases, but is inactivated by extended-spectrum beta-lactamases.

It was approved by the U.S. Food and Drug Administration (FDA) in 1986.