An inhaler or puffer is a medical device used for delivering medication into the body via the lungs. It is mainly used in the treatment of asthma and Chronic Obstructive Pulmonary Disease (COPD).OverviewMedication is most commonly stored in solution in a pressurized canister. The canister is attached to a plastic, hand-operated actuator. For example, the metered-dose inhaler (MDI) on activation releases a fixed dose of medication in aerosol form. The correct procedure for using a MD