Spiriva 18mcg Capsule is an anticholinergic medicine. It is used in the treatment of chronic obstructive pulmonary disease and asthma. Tiotropium is used to control and prevent symptoms (such as wheezing, shortness of breath) caused by ongoing lung disease (chronic obstructive pulmonary disease-COPD which includes bronchitis and emphysema). It works by relaxing the muscles around the airways so that they open up and you can breathe more easily.