How to know when you need a new inhaler

For the Genuair inhaler, when you see a red band appear in the dose counter it means you have 10 doses left. After your last dose is taken the coloured lever will lock in place and a zero highlighted in red will appear in the counter window.

For Respimat, when the pointer enters red scale there are less than 30 doses left). Once it hits zero the whole device will lock up so you cannot turn it.