An inhaler is a type of dosage form used to deliver medication directly to the lungs. The medication is contained in a pressurized canister and is released as a fine mist or powder when the patient inhales through the mouthpiece. Inhalers are commonly used for respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD) and are an effective way to deliver medication directly to the airways. Inhalers come in two main forms: metered-dose inhalers (MDIs) and dry powder inhalers (DPIs). MDIs deliver a precise amount of medication with each puff, while DPIs require the patient to inhale deeply and quickly to activate the medication. Proper technique is important when using an inhaler to ensure that the medication is delivered effectively to the lungs.