It can be difficult to use the correct technique with a metered-dose inhaler alone, and it is ideally recommended to use a spacer. A spacer is a tube-like device that attaches to the metered-dose inhaler. It helps deliver the medicine to the airways of the lungs directly instead of the mouth. This helps the medicine work better and lessens the side effects of the inhaled medication.
A dry-powder inhaler (DPI) is a type of portable inhaler device that can be used to deliver aerosol medications to the lungs. DPIs deliver the medication to the lungs as a very fine powder. DPIs are breath actuated.Which means that DPIs do not contain propellant (the stuff in the pMDI that produces the force to change liquid medication into an aerosol). Instead, the fine powder is drawn from the DPI when you take a quick and deep breath through the DPI. Currently, there are 3 types of dry-powder inhalers: single-dose DPIs, multiple unit-dose DPIs, and multiple dose DPIs.
HFA stands for Hydrofluoroalkane, a propellant used for inhalation. An HFA inhaler is a fast-acting inhaler used in the Asthma treatment. It's the most recent and environmentally safe inhaler. They do not release CFFs (chlorofluorocarbons) that are dangerous for the ozone layers.
Inhalers are essential part of Asthma treatment, they offer the advantage of delivering the medicine right into the respiratory airways. Unlike the oral medication, the inhaled medicines do not reach other parts of body. It means that the side effects of the treatment are minimal. It is safe to use inhaler as prescribed by your doctor.
Dr. Rakesh Gupta M.D
Director of Sleep Disorders Center, Providence, RI.