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Antimicrobials
Patients on IV therapy can be switched safely to oral therapy once:
See Pathogen-Directed Therapy for Pneumonia
In the absence of positive microbiology, recommended oral step-down of initial intravenous therapy is described below
Note: Complete concurrent course of azithromycin as appropriate
Azithromycin 250-500 mg PO daily*
*Azithromycin duration is 500 mg for 3 days, or 500 mg once followed by 250 mg for 4 days. Longer duration may be necessary in Legionella infection.
Amoxicillin 500 PO TID or 1000 mg PO BID
OR IF PENICILLIN ALLERGY
Cefuroxime 500 mg PO BID
Moxifloxacin 400 mg PO daily
Amoxicillin-clavulanate 875-125 mg one tab PO BID
Empiric vancomycin can be discontinued if nasal MRSA swab is negative, and no MRSA identified in blood or sputum cultures. Nasal MRSA swabs have a high negative predictive value in CAP