Many of us use paracetamol for common issues like headaches, toothaches, or to lower a fever. However, when taken improperly, it can lead to severe health risks, including liver failure. A US medical expert, Professor John Brems, has labeled one form of paracetamol, acetaminophen, as "America's most dangerous over-the-counter drug."
Both illicit and legal substances can be harmful when abused. In the United States, for instance, accidental drug overdoses have caused more deaths than car accidents. Even when generally considered to be safe, all drugs can be fatal when taken too much or used inappropriately.
From well-known prescription medications to famous street drugs and combinations of both, many of the drugs in this gallery make the list of the most dangerous substances around. Want to know what they are? Click on for more.