Abstract: An extension that is attachable to metered dose inhalers for more effective and efficient delivery of the medication to the lungs of the user. The extension comprises a member having a bore therethrough that is sized and configured at a first end to match the size and shape of the inhaler nozzle, tapers to a reduced cross-section and extends with a generally uniform cross-section for at least one inch to the second end so as to force the user to slowly inhale the medication into the lungs. An adaptor attached to the first end of the member receives the nozzle therein so that the nozzle is in fluid flow communication with the bore of the member. A portion of the member, including the second end, defines a mouthpiece at least one and one half inches long that is receivable in the mouth of a user.