On the other hand, if your inhaler is only for occasional or rescue use, like during an asthma attack, it might expire before you use up all the metered puffs. An expired inhaler will not harm you and cause adverse effects, but it may not provide you with the same amount of relief.Īlthough the inhaler's expiration date is about one year after the purchase date, you'll likely run out of it before that time if you're prescribed it for daily use. In a situation where you need a rescue inhaler, it's better to use an expired inhaler than no inhaler at all, Parsons says. Yes, you can still use an expired inhaler
