A pham composition comprising carbapenem and Aztreonam each in the dosage range of about 0.25 g to 0.75 g and pharmaceutically acceptable excipients for the prevention and treatment of infections caused by Pseudomonas acrugi nosa, Acinetobacter baumannii, Klebsiella pneumoniae or MRSA (Methicillin Resistant Staphylococcus aureus).
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