You probably don’t have to look very far in your circle to find someone with a breathing difficulty that has to use metered dose inhalers (like Ventolin or Flovent) If you are one of those people, you can get improved effect from your inhalers using a simple spacer device on the inhaler. The technique for using a spacer device is a little different, but when used properly it can increase the amount of medication that gets to the lungs by up to 70% and help to decrease side effects.