I would like to raise an issue and do a straw-poll to see if others have the same experience.
I use an 120puff preventer inhaler - should give 30 days at 4 puffs daily. However, about 2-3 weeks in, just about every month the inhaler stops firing properly. The volume and pressure of propellant is significantly reduced. I think it’s not delivering my meds in the stated dose. I always experience a downturn in symptoms at this time. When I start the new inhaler, they improve.
I have a theory - and in true scientific fashion I would love to be proved wrong - that the inhalers overdeliver dosage when new and heavily underdeliver towards the end of their prescripted time.
This did not happen back when I used the “tall” inhalers but has been a consistent experience since the new smaller (evohalers I think?) were prescribed.