Dry powder inhalers (DPIs) are devices used to deliver medication directly to the lungs in the form of a dry powder. They are commonly prescribed for conditions like asthma and chronic obstructive pulmonary disease (COPD). DPIs require the patient to take a deep, fast breath to activate the device and inhale the medication effectively. Unlike metered-dose inhalers, DPIs do not use propellants to deliver the medication. Instead, they rely on the patient's inhalation effort to disperse the powder. This makes them portable and easy to use, but proper technique is essential for effective treatment.