Metered Dose Inhalers

Metered dose inhalers are used to treat lung-based disorders. To use them, you have to follow a series of steps in order. If the steps are not completed in the right manner, then the medication will not be delivered effectively.

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About Metered Dose Inhalers

Metered Dose Inhalers (MDIs) are vital devices employed to administer medication directly into the lungs through a self-administered, aerosolized burst of medicine. These inhalers are instrumental in treating respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Comprising three key components—a canister, an actuator, and a metering valve, they are designed for precise and convenient medication delivery.

Canister: The canister is typically crafted from materials like aluminum or stainless steel and holds the medication formulation. This formulation may be dissolved or suspended in a propellant.
Metering Valve: The metering valve plays an important role in dispensing a precisely measured quantity of medication when activated.
Actuator: The actuator serves as the interface between the user and the MDI, allowing them to operate the device and directing the medication toward the lungs.

Upon actuation, the Metered Dose Inhalers releases a single metered dose of medication, often in the form of micro-sized droplets, for effective inhalation therapy.

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Using a Metered Dose Inhalers (MDI)

Remove the Cap: First, remove the cap from the MDI
Shake the Inhaler: Shake the inhaler gently to ensure proper mixing of the medication within the canister.
Spray in the Air: Before inhaling, perform a ‘test spray’ by directing the inhaler away from your face and pressing the canister to release a puff into the air. This step helps ensure that the MDI is functioning correctly and clears any residue from the previous use.
Inhale: Position the mouthpiece of the MDI between your lips, forming a secure seal, and inhale deeply and slowly. Simultaneously, press down on the canister to release the medication. This ensures that the medication is delivered into your lungs.
Hold Your Breath: After inhaling, hold your breath for about 10 seconds to allow the medication to penetrate deeply into your respiratory system.
Exhale: Exhale slowly and gently.
Replace the Cap: Finally, replace the cap on the MDI to protect it from dust and contamination.

Duration of Usage

The time required to use a Metered Dose Inhaler (MDI) is relatively brief, typically taking only a few minutes. The entire process, including inhalation, should take no more than 30 seconds per dose.

Potential Side Effects

Throat irritation
Hoarseness
Candidiasis (yeast infection in the mouth)
Tremors (shaking)
Increased heart rate
Restlessness

It’s essential to discuss any side effects or concerns with your doctor. They can provide guidance on managing side effects and adjusting your medication regimen if necessary.

Considerations While Using MDI's

Always check the expiration date on your MDI, and ensure it is well-stocked with medication, especially in case of emergencies.

Some MDIs are equipped with a dose counter to help you keep track of the remaining doses.

For added comfort and improved delivery, consider using a spacer, particularly if you find it challenging to coordinate inhalation and actuation.

Metered Dose Inhalers