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Dry powder inhalers (DPIs) are devices used to deliver medication in a dry powder form directly into the lungs. They are commonly prescribed for the management of respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Unlike metered-dose inhalers (MDIs) which use a propellant to expel medication, DPIs rely on the patient's own inhalation effort to draw the powder into the airways.

There are several types of DPIs, broadly categorized by their design and how they hold and dispense the medication. Some common designs include breath-actuated inhalers, which release the medication only when the patient inhales, and pre-metered devices, where each dose is individually packaged. Another type is the multi-dose dry powder inhaler, which contains a reservoir of medication that is dispensed in precise doses with each actuation.

Using a DPI effectively requires proper technique. Patients are typically instructed to hold their breath for a short period after inhaling the medication to allow it to deposit in the lungs. The effectiveness of DPIs can be influenced by factors such as the patient's inspiratory flow rate and the specific device used. Training and demonstration by a healthcare professional are crucial to ensure correct usage and optimal therapeutic benefit.