noun. A synthetic antibiotic, C₁₃H₁₇N₅O₈S₂, that acts against a wide spectrum of gram-negative bacteria.

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

noun. an antibiotic (trade name Azactam) used against severe infections; has minimal side effects

"In the EU, Cayston is referred to as aztreonam lysine 75 mg powder for nebuliser solution and can only be used with the Altera Nebuliser System or with the Altera Nebuliser Handset"

antibiotic  antibiotic drug