Atropine is a drug that is used to help reduce the production of saliva in the mouth prior to surgery. It also treats spasms that occur in the intestines, stomach and other organs. Atropine can be used to counter the effects of specific medications. Additionally, this drug also aids in controlling the secretions of numerous organs in the body, including saliva. During heart surgery, Atropine is used to maintain the heart's function and can also be used to treat certain heart conditions. This drug works by blocking the action of a chemical called acetylcholine.