Decreasing the production of saliva and secretions of the airway prior to surgery. It is also used to treat spasms in the stomach, intestines, and other organs. It may also be used to counteract the effects of certain other medicines or for other conditions as determined by your doctor. Atropine is an anticholinergic. It works by blocking the effects of a chemical in the body (acetylcholine) in the nervous system, stomach, intestines, certain glands (eg, salivary gland), urinary tract, and other tissues.