Merck Manual

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How to Use a Metered-Dose Inhaler
Metered Dose Inhaler
How to Use a Metered-Dose Inhaler
  • Shake the inhaler after removing the cap and apply the spacer.

  • Breathe out for 1 or 2 seconds.

  • Put the mouthpiece of the spacer between your teeth and close your lips tightly around the mouthpiece. If you are using a mask attached to the spacer, place the mask completely over your nose and mouth. Start to breathe in slowly, like sipping hot soup.

  • While starting to breathe in, press the top of the inhaler.

  • Breathe in slowly until your lungs are full. (This should take about 5 or 6 seconds.)

  • Hold your breath for 10 seconds (or as long as you can).

  • Breathe out and, if a second dose is required, repeat the procedure after 1 minute.