Take it back to the pharmacy, they have made a mistake and given you a 30 dose inhaler (a 30 dose inhaler is a doctors normal sample size in my experience). A 60 dose inhaler should read 60 on its dial when new.
The quantity isn't the same as the number of doses. It is the amount of active ingredient measured in mls or mgs. So if your inhaler has 30 doses of 2mls or 2 mgs each, that would make the quantity 60.
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