Tab Ciprofloxacin 500 mg BD REF: Harrison 17th ed table 141-3 This is a case of legionella pneumonea; clue is loose stools with pneumonia Antimicrobial Agent Dosage Macrolides Azithromycin 500 mg PO or IV q24h Clarithromycin 500 mg PO or IV ql2h Antimicrobial Agent Dosage Quinolones Levofloxacin 750 mg IV q24h 500 mg PO q24h Ciprofloxacin 400 mg IV q8h 750 mg PO ql2h Moxifloxacin 400 mg PO q24h Ketolide Telithromycin 800 mg PO q24h Tetracyclines Doxycycline 100 mg PO or IV ql2h Minocycline 100 mg PO or IV q12h Tetracycline 500 mg PO or IV q6h Tigecycline 100 mg IV load, then 50 mg IV q12h Others Trimethoprim-sulfamethoxazole 160/800 mg IV q8h 160/800 mg PO ql2h Rifampin 100-600 mg PO or IV ql2h