This invention relates to a pressurised metered dose inhaler comprising a canister, wherein the canister contains a formulation comprising a tiotropium salt and an HFA propellant, wherein the inhaler is an inhalation-actuated inhaler.本發明係關於包括藥罐之加壓計量劑量吸入器,其中該藥罐含有包括噻托銨(tiotropium)鹽及HFA推進劑之調配物,其中該吸入器係吸入致動式吸入器。