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Monobactams are drugs with a monocyclic β-lactam ring. Their spectrum of activity is limited to aerobic Gram-negative organisms (including P aeruginosa). Unlike other β-lactam antibiotics, they have no activity against Gram-positive bacteria or anaerobes. Aztreonam is the only monobactam available in the USA. It has structural similarities to ceftazidime, and its Gram-negative spectrum is similar to that of the thirdgeneration cephalosporins. It is stable to many β-lactamases with notable exceptions being AmpC β-lactamases and extendedspectrum β-lactamases. It penetrates well into the cerebrospinal fluid. Aztreonam is given intravenously every 8 hours in a dose of 1–2 g, providing peak serum levels of 100 mcg/mL. The half-life is 1–2 hours and is greatly prolonged in renal failure. Penicillin-allergic patients tolerate aztreonam without reaction. Notably, because of its structural similarity to ceftazidime, there is potential for cross-reactivity; aztreonam should be used with caution in the case of documented severe allergies to ceftazidime. Occasional skin rashes and elevations of serum aminotransferases occur during administration of aztreonam, but major toxicity is uncommon. In patients with a history of penicillin anaphylaxis, aztreonam may be used to treat serious infections such as pneumonia, meningitis, and sepsis caused by susceptible Gram-negative pathogens. • #monobactum #aztreonam #chemotherapeutics

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