Remove the caps from the inhaler and spacer. Shake the inhaler.
Put the inhaler into the open end of the spacer -- it’s opposite the spacer's mouthpiece.
Breathe out completely.
Put the mouthpiece of the spacer between your teeth and close your lips tightly around it.
Press the inhaler canister once to release the medicine, which will be trapped in the spacer.
Breathe in slowly and completely through your mouth. Some spacers, will make a horn-like sound if you breathe too quickly...