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I sometimes use the salbutamol one before a ride but I find it very hard to tell whether or not it's doing anything
If you can't tell whether it's doing anything, there's a very high probability that you're doing it wrong. I see an awful lot of really ineffective inhaler technique out there, and if that's you then you're probably getting no more than 10% of the intended dose to the relevant tissues. Talk to your GP or asthma nurse about technique, and consider using a spacer to avoid wasting your drugs.
Your GP can prescribe spacers and basic mechanical PF meters, but if you want to go #tartmode you can buy digital meters so you can see pretty graphs on your PC or phone.
Good info folks. I'll definitely be seeing my GP for a preventative inhaler and will see if it makes any difference. I sometimes use the salbutamol one before a ride but I find it very hard to tell whether or not it's doing anything. Maybe a peak flow meter would be handy