Arsenic Medicine (IMAGE) Dartmouth College Caption Arsenic, today known to be both toxic and potentially carcinogenic, was widely used as a medicine in the 19th and 20th centuries. Credit National Museum of American History, Behring Center, Smithsonian Institution Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.