Dry Powder Inhaler (DPI)
How it works:
Delivers medication in the form of a dry powder.
Breath-actuated: the patient inhales rapidly and deeply to pull the medication into the lungs.
Key points:
No propellant (environmentally friendly).
Requires strong and fast inhalation.
Often comes in capsule or blister form to be punctured before inhalation.
Pros:
Portable and compact.
No need for hand-breath coordination.
Environmentally friendly.
Cons:
Not suitable for young children or very sick patients (who can't inhale strongly enough).
Moisture can affect powder.
🔸 Metered Dose Inhaler (MDI)
How it works:
Delivers a specific amount of aerosolized medication using a propellant gas (like HFA).
Activated by pressing the canister and inhaling simultaneously.
Key points:
Requires hand-breath coordination, unless used with a spacer.
Propellant-based delivery
Pros:
Fast-acting relief.
Useful for all age groups when used with a spacer.
Portable and quick to use.
Cons:
Difficult for some patients to coordinate.
Uses propellants (environmental concerns).
Needs regular cleaning to prevent blockage.