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in reply to @hippy
The brown inhaler is a preventer which in my and my daughter's case is two puffs morning and night. The blue is to ease the wheeze so to speak should it occur. I haven't needed the blue since my polypectomy/septoplasty op in June. They should, as far as I know, be prescribed together (or have been for us).
My daughter is suffering badly at present because she is fifteen and has a cold and knows better that the doctors when it comes to brown puffs or blue for that matter. It has stopped her running and trips to the gym but she is still a pain in the arse.
Repeat prescription.
If the blue one doesn't work, you may be put on a brown one.
When you get a cold / chest infection, you get a TUE, and will turn into a machine.