For which type of inhaler is it important to shake before use?

It is essential to shake metered-dose inhalers (MDIs) before use because they contain a pressurized propellant that mixes with the medication. Shaking the inhaler ensures that the medication is thoroughly mixed with the propellant, leading to a consistent dose being delivered with each spray. If the inhaler is not shaken, the medicine could settle, resulting in an improper amount being inhaled, which may reduce the effectiveness of the treatment.

In contrast, dry powder inhalers do not require shaking because they utilize a different mechanism and are designed to deliver the medication in powdered form without the need for a propellant. Liquid inhalers generally do not require shaking in the same way that MDIs do, as they are designed to release medication from a solution. Breath-actuated inhalers are triggered by the patient’s inhalation and also do not require shaking prior to use since they are designed to ensure proper dosing with each breath taken. Understanding the specific usage guidelines for different types of inhalers is crucial for effective asthma or COPD management.