Metered-dose inhalers (MDI) deliver a SPRAY. You can’t just spray the medicine into your mouth as it won’t get down into your lungs. You must use MDI devices with a SPACER, no matter how old you are.
Another type of inhaler delivers a POWDER into your lungs when you breathe in (Turbuhaler, Diskhaler, Spinhaler). These are usually only suitable for older children and adults.