Antibiotic formulations, unit doses, kits and methods

1. A method of administering an aerosolized pharmaceutical formulation to a patient who is breathing under the assistance of a ventilator, the method comprising:

providing a unit dose container containing from 5 ml to 6 ml of an aqueous composition for aerosolization comprising:

anti-gram-negative antibiotic or salt thereof being present in the unit dose container at an amount from about 550 mg to about 750 mg and a concentration from about 110 mg/ml to about 150 mg/ml, wherein the anti-gram-negative antibiotic comprises amikacin or salt thereof;

aerosolizing the aqueous composition; and

administering the aerosolized composition into a ventilator circuit in the ventilator at a position between a junction of the inhalation and exhalation lines and an endotracheal tube so that it may be mixed with respiratory gases in the ventilator circuit and delivered to the patient.

2. The method of claim 1 , wherein the aqueous composition consists essentially of the anti-gram-negative antibiotic or salt thereof and water.

3. The method of claim 1 , wherein the amikacin or salt thereof has a potency from about 500 μg/mg to about 1100 μg/mg.

4. The method of claim 1 , wherein the aqueous composition has a pH from about 4 to about 6.

5. The method of claim 1 , wherein the aqueous composition has an osmolality ranging from about 90 mOsmol/kg to about 500 mOsmol/kg.

6. The method of claim 1 , further comprising an additional active agent selected from an anti-inflammatory and a bronchodilator.