All medicines including inhalers have an expiry date, usually under specified storage conditions. Medicines should not be used after their expiry date. Expiry dates for inhalers are printed on the outer cardboard box and on the canister and/or plastic device.
Some inhaler devices are also be packaged in a foil laminate or plastic pouch, usually containing a sachet of drying agent inside the outer cardboard box. Product Information and Consumer Medicines Information may include recommendations on in-use shelf life.
The in-use shelf life refers to the period during which the inhaler remains safe and effective after it has been opened for use. The period typically differs from the overall expiry date printed on the packaging.
Once these inhalers are exposed to air and moisture, they must be used within a specified timeframe to avoid reduced stability and efficacy. It is a good idea to label the inhaler with the date opened to keep track of when its in-use shelf life ends.
Always refer to the specific instructions that come with each inhaler, as manufacturers provide recommendations tailored to each device and medication.
For further information download the In-use shelf life of inhalers PDF which includes a table with a summary of in-use shelf life of inhalers available in Australia from the Australian Register of Therapeutic Goods (ARTG).
Useful links:
Shelf life of asthma inhalers - article in the MJA's Insight+
NAC cautions vigilance for asthma medication added to 60-day dispensing list
