Injectable form is used for inhalation: prepare by reconstituting vial with 3mL of normal saline (= 50 mg/mL)
Further dilute dose with normal saline for nebulization
Stable for 24 hours, refrigerated
For IV dosing in CF: higher doses 5-8 mg/kg/24 hours may be required for resistant organisms, however, higher doses are associated with more severe toxicity