Isotonic Saline Solution - Sodium Chloride NaCl - Inhalation Saline Solution for Humidifying The Airways – ml Unit Dose Vials, Pharmaceutical Grade Isotonic - 10 Vials. Works Effectively for Humidifying the Airway : isotonic Inhalation Solution is highly compatible with body fluids and ensures sufficient humidification of the respiratory mucosa, thus avoiding the unpleasant sensation of dryness.