The Difference between inhalation and aerosol:
As the name implies, the inhalation is to rely on manual operation to spray the liquid, like people commonly used shampoo, need to press to squeeze out the same liquid. Its advantage is low cost, widely used, such as various types of nasal spray (referred to as nasal spray).
The aerosol is powered by high pressure gas without the need for external forces. Once the switch is activated, the high pressure gas in the bottle will drive the liquid spray, just like the usual spray insecticide. The principle of this drug formulation is passive inhalation. To salbutamol, for example, high-pressure gas into the patient's airway, you can quickly lift the airway spasm, restore ventilation, relieve symptoms. Its disadvantage is that high-pressure gas may cause discomfort to patients, leading to airway contraction and other stress response.