* A spacer is needed to hold your asthma medicine in a cloud until you can pull it into your lungs with a deep breath. * If you don’t use a spacer with your asthma medicine, it ends up on tongue and on the walls of your throat where it can’t help your asthma and usually causes a yeast infection. * Spacers should be used with all of your asthma medicine that comes in a metered dose inhaler (MDI). * Medicine administered by a dry powder inhaler does not require a spacer since the design of the inhaler stirs and suspends the dry powder particles so they can be inhaled deeply.