Three types of nebulizer machines are available in the market today depending on the mode of drug delivery, namely: 1. Jet or Compressor Nebulizer Machines: This type usually utilizes a compressor system to aerosolize the liquid medicine so that it can be inhaled via a mouthpiece or a face mask. 2. Ultrasonic Nebulizers: They utilize high-frequency sound waves to make a fine mist out of the medicine that can be directly inhaled by the patient to the lungs. 3. Mesh or Vibrating Nebulizers: Through a vibrating force, the liquid medicine is forced to pass through a mesh network of tiny holes to become aerosolized. They provide the most efficient means of delivering medicine but are a bit expensive.