Atropine is a medication used to treat certain types of nerve agent and pesticide poisonings, some types of slow heart rate, and to decrease saliva production during surgery.It is typically given intravenously or by injection into a muscle.Eye drops are also available which are used to treat uveitis and amblyopia.The intravenous solution usually begins working within a minute and lasts half an hour to an hour.Large doses may be required to treat poisonings.