What is the first step a client should take before using a metered-dose inhaler (MDI)?

Before using a metered-dose inhaler (MDI), shaking the inhaler immediately before use is an essential first step. This action ensures that the medication is properly mixed and ready for delivery. Many MDIs contain suspension formulations where the active ingredient may settle at the bottom of the canister. By shaking the inhaler, the patient helps to distribute the medication evenly within the propellant, facilitating a consistent dose with each use.

Following this step, the client can then proceed with the sequence of inhalation, exhaling, and holding their breath as recommended for optimal medication delivery and absorption. Proper administration technique is crucial for maximizing the therapeutic effects of the inhaled medication, and shaking the MDI is foundational in ensuring the medication is effectively delivered to the lungs.