Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Metered-dose inhaler
Medically reviewed by Min Clinic Staff | Updated: January 2026
Metered-dose inhaler: Abbreviated MDI. A device that delivers a measured amount of medication as a mist the patient can inhale. A MDI consists of a pressurized canister of medication in a case with a mouthpiece. MDIs are portable, efficient and convenient. People with asthma, chronic obstructive pulmonary disease (COPD), chronic bronchitis, and emphysema.