This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
Proper Inhaler Technique: Metered-Dose Inhaler Guide
Mastering proper inhaler technique ensures that asthma and COPD medications reach deep into your bronchial airways rather than depositing in your mouth and throat. Learning the correct sequence of shaking, inhaling, and breath-holding maximizes symptom control and minimizes adverse effects. If you use a spacer, these steps adapt easily to provide even better drug delivery.
Quick Summary
Using correct inhaler technique ensures your respiratory medication reaches your lungs effectively to control symptoms and prevent side effects.
Important Medical Disclaimer
This guide is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare providers for medical concerns.
Step-by-Step Guide
Prepare and Shake the Inhaler
Remove the protective cap from the mouthpiece and check that the opening is clean, dry, and free of lint or debris. Shake the canister vigorously up and down for approximately five seconds to evenly mix the medication and propellant. If you are using a new inhaler or have not used it in several days, test-spray it into the air according to the manufacturer priming instructions.
Important: Failing to shake the inhaler before each use can cause you to receive an inconsistent dose containing too much propellant and too little active drug.
Sit Up Straight and Breathe Out Fully
Sit or stand upright to allow your lungs and diaphragm to expand fully during administration. Turn your head away from the inhaler and gently exhale until your lungs feel empty. Emptying your lungs beforehand creates sufficient space to inhale deeply and draw the medication deep into your lower airways.
Position the Mouthpiece
Bring the inhaler to your mouth and place the mouthpiece between your teeth, resting your tongue flat so it does not block the opening. Close your lips tightly around the mouthpiece to form an airtight seal. If you are using a spacer or valved holding chamber, insert the inhaler into the rubber ring and place the spacer mouthpiece securely in your mouth.
Actuate and Inhale Slowly and Deeply
Begin breathing in slowly and steadily through your mouth, and immediately press down firmly on the top of the canister once to release the dose. Continue inhaling smoothly over three to five seconds until your lungs are completely filled with air. A slow, steady breath ensures the aerosolized particles bypass the back of the throat and reach deep into the lungs.
Important: Do not breathe in quickly or sharply with a metered-dose inhaler; inhaling too rapidly causes the drug to impact the back of your throat instead of reaching your airways.
Hold Your Breath
Remove the inhaler or spacer from your mouth and close your lips. Hold your breath for up to 10 seconds, or for as long as is comfortably possible without straining. This pause allows the suspended medication droplets to settle onto the walls of your smaller airways rather than being exhaled immediately.
Wait Before Taking a Second Puff
Exhale gently and resume normal breathing. If your doctor has prescribed a second puff, wait roughly 30 to 60 seconds before repeating the process from the shaking step. This brief waiting period allows the first dose to begin opening the airways, improving penetration for the subsequent puff.
Rinse Your Mouth and Replace the Cap
Replace the protective cap over the mouthpiece immediately to protect it from dust and lint. If your inhaler contains a corticosteroid, thoroughly swish your mouth with water and spit it out into the sink. Cleaning your spacer weekly with warm soapy water and allowing it to air-dry also maintains optimal device hygiene.
Important: Always spit out the rinse water; swallowing it increases the risk of systemic side effects, oral thrush (fungal infection), and hoarseness.
Frequently Asked Questions
Why is using a spacer recommended with metered-dose inhalers?
How do I know when my inhaler is empty?
What should I do if I see a cloud of mist escape around my mouth?
How does using a dry powder inhaler (DPI) differ from a metered-dose inhaler (MDI)?
Sources & References
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- 3Mayo ClinicSource
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Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed October 19, 2026. · Read our editorial policy