Nebulizers are drug delivery devices that use oxygen, compressed air, or ultrasonic energy to convert drug suspensions or solutions into aerosols or mist. Drugs in the form of aerosols or mist are easier for the user to inhale and the lungs to absorb. This drug delivery method helps administer different drugs, such as bronchodilators, antibiotics, antifungals, corticosteroids, and anti-inflammatory medications, for treating various respiratory disorders such as COPD, asthma, cystic fibrosis, and bronchitis. Nebulizers are often used for drug delivery to clear breathing passages, reduce inflammation in the airways caused by pollutants or infection, reduce mucous membrane swelling, treat upper respiratory infections, and mobilize and thin out secretions for easy removal. These devices are useful to treat children and adults who cannot manage their treatment with inhalers.