Leak Rate. It is common for MDIs to lose propellant during storage. The propellant-leak rate of the test MDIs was compared with that of the controls (Figure 3). The leak rates for the Proventil ...

and can add a maximum of four extra puffs per day if needed. She only needs to take the inhaler if her asthma is particularly bad, or if she has a cold. She should use her usual dose of one puff twice ...

After exposure to extreme environmental temperatures, an increase in propellant-leak rate was observed with Proventil HFA and Ventolin HFA MDIs, but little to no change was found in particle size ...