The most widely used medicine deployed in the American Civil War (1861-1865) was ‘calomel’, used to treat ailments ranging from headaches to syphilis. What was its main ingredient?

Answer: Mercury. When one leading Union army physician, William Hammond, correctly noted that mercury was poisonous, he was deemed a quack and speedily removed from his post.

Source: The Army Medical Department by Mary C. Gillett

More at: History

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