Inhalers should be shaken vigorously for how many seconds before use?

• A. 2 seconds
• B. 5 seconds
• C. 10 seconds
• D. 15 seconds

Answer: (B)

Shaking for about five seconds re-suspends the medication in the propellant so each puff delivers a consistent, accurate dose. If this step is skipped or shortened, the drug can settle and the spray may be uneven or deliver less medication, leading to reduced effectiveness. Five seconds is the standard duration that reliably prepares the inhaler for proper dosing. Other inhaler types, such as dry powder inhalers, don’t require shaking because they deliver medication in a different way.