Zerostat Spacer Device 1 is used for improving the efficiency of inhaler medication by allowing the medicine to be held in the chamber for a few seconds after being released from the Metered-Dose Inhaler (MDI). The Zerostat Spacer is a device into which the medicine from your inhaler is released for inhalation. It helps to hold the medicine for a few seconds to make it easier for you to inhale it. The Zerostat Spacer also allows the medicine to reach the lungs with minimal deposition in the mouth or throat. The Zerostat Spacer has been designed to help you obtain the full benefit of the medicine released from your inhaler.