Unless your inhaler has a counter, it can be difficult to know when your inhaler is empty. Shaking it to listen for the sound can be misleading, as there may still be propellant without medication. Using the “float test” is no longer recommended and may damage your inhaler. The easiest way to tell how many puffs you have left is to put a sticker on your inhaler and simply mark it each time you use it. Your inhaler will be labeled with the number of puffs it contains.