How to prime an inhaler

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How to Prime an Inhaler

Priming an inhaler is a crucial step to ensure that the medication is delivered effectively. This process involves preparing the inhaler for use by ensuring that the medication is properly aerosolized and ready for inhalation. Below are the steps and considerations for priming different types of inhalers.

Priming Metered-Dose Inhalers (MDIs)

Steps to Prime MDIs

Shake the Inhaler: Shake the inhaler well to mix the medication properly.
Release Test Sprays: If the inhaler is new or has not been used for a while, release a few test sprays into the air. This helps to ensure that the inhaler is working correctly and that the medication is evenly distributed .
Check the Instructions: Always refer to the specific instructions provided with your inhaler, as the number of test sprays required can vary.

Importance of Priming MDIs

Priming is essential for MDIs because it ensures that the medication is delivered in the correct dosage. Without priming, the first few doses may not contain the correct amount of medication, leading to ineffective treatment .

Priming Dry Powder Inhalers (DPIs)

Steps to Prime DPIs

Load the Dose: For most DPIs, you need to load the dose by either twisting the inhaler or pressing a button.
Check for Readiness: Ensure that the inhaler is ready for use by checking the dose counter or indicator, if available .

Importance of Priming DPIs

DPIs generally do not require priming in the same way as MDIs. However, ensuring that the dose is properly loaded is crucial for effective medication delivery .

Priming Soft Mist Inhalers (SMIs)

Steps to Prime SMIs

Assemble the Inhaler: If the inhaler is new, you may need to assemble it according to the manufacturer's instructions.
Release Test Sprays: Similar to MDIs, release a few test sprays into the air to ensure the inhaler is working correctly.

Importance of Priming SMIs

Priming SMIs ensures that the medication is aerosolized correctly, providing an effective dose with each use.

Special Considerations for Spacer Devices

Priming Spacer Devices

Coat the Inner Surface: For plastic spacers, it is recommended to prime by firing 20 doses of placebo aerosol into the spacer. This coats the inner surface with surfactant, reducing static charge and improving medication delivery.
Metal Spacers: Metal spacers do not require priming as they are not affected by static charge.

Importance of Priming Spacer Devices

Priming plastic spacers reduces the retention of the drug on the spacer walls, thereby increasing lung deposition and ensuring effective treatment.

Conclusion

Priming an inhaler is a simple yet essential step to ensure effective medication delivery. Whether using MDIs, DPIs, or SMIs, following the specific priming instructions for each device can significantly improve treatment outcomes for asthma and COPD patients. Proper training and regular technique checks are vital to maintain effective inhaler use over time .