Shake the MDI vigorously. Breathe out completely, fully emptying your lungs. Then place the tip of the MDI mouthpiece between your teeth and gently close your lips around the mouthpiece, creating a seal.
Begin to breathe in slowly and deeply through your mouth immediately before activating your MDI. Just as you begin to inhale slowly, firmly press the container down into the mouthpiece once only. This releases the medication.
Since you started to breathe in slowly immediately before activating the MDI, you should be able to continue to inhale slowly after the MDI has been activated until you reach maximum inhalation. Then hold your breath for 10 seconds and breathe out slowly through gently pressed together lips.