After loading a dose into the Symbicort Turbohaler inhaler, can I inhale several times to make sure that the entire dose has been taken?

There is no need for this. It is necessary to make a maximally deep and maximally intense inhalation through the mouth. The amount of the drug contained in one inhalation dose is very small, therefore, after inhalation, the taste of the drug may not be felt. If you load the dose of the drug correctly - that is, you will hear a characteristic click, you can be sure that the drug has been taken correctly (I attach a photo of a fragment of the leaflet). The dose counter does not change each time you take the medicine. The dose counter scale is marked every 10 inhalations (in inhalers containing 60 and 120 doses) and every 15 inhalations (in an inhaler containing 30 doses). Therefore, the dose counter does not indicate a change after a single dose of the drug. The appearance of a red marker on the edge of the dose counter window means that there are about 20 doses of the drug left in the inhaler. When administering the last 10 doses of the drug, the background of the dose counter window is red. When the number 0 on a red background is in the middle of the counter window, it means that you should start using the new Symbicort Turbohaler inhaler. Therefore, in the case of this type of inhalers, as I mentioned earlier, it is important to properly load the drug and a characteristic click. I also attach a link to the leaflet, where step by step you will find out how to take the dose of the drug correctly: https://www.gdziepolek.pl/produkty/76346/symbicort-turbuhaler-160-mcg-4-5-mcg-proszek-do-inhalacji/ulotka/62470