Previously (as in between 2014 and 2017) I was told that I should see an improvement in 2 weeks. If not go back and speak to the doctor.
Just been told 2-3 months? Been on medication (that didn't work first time around) for 2 weeks and having to take Salamol (the blue one ) daily. Both NHS and Asthma+Lung websites state to see your GP if you're using your blue inhaler more than 3 times a week.
I told my GP that I'm taking anything up to 8 puffs a day. They've just told me to wait until March. I've just had to ask for another blue inhaler. My previous blue inhaler was prescribed 3 weeks ago . No one has questioned why I take so much of it.
I've seen very little (250 - 280) improvement in my peak flow.
I think I've had one day where I've not had any Salamol. They know the problem seems to be that the preventer wears off too quickly. (If I take it at 9am, I'm struggling by 4pm)