Salbutamol

The normal way to use a salbutamol inhaler (both adults and children) is 1 or 2 puffs when needed. It can be used it up to a maximum of 4 times in 24 hours, regardless of whether you have 1 puff or 2 puffs at a time.

Call yor GP if you need to use your salbutamol inhaler:

-more than 4 times in 24 hours

-3 or more days each week

-in the middle of the night at least once a week

In a sudden asthma attack you can use your inhaler more and take up to 10 puffs. Wait 30 to 60 seconds between each puff and always shake the inhaler each time. 

*Source: https://www.nhs.uk/medicines/salbutamol-inhaler/how-and-when-to-use-salbutamol-inhalers/