In October of 1982, Tylenol, the leading pain-killer medicine in the United States at the time, faced a tremendous crisis when seven people in Chicago were reported dead after taking extra-strength Tylenol capsules. It was reported that an unknown suspect/s put 65 milligrams of deadly cyanide into Tylenol capsules, 10,000 more than what is necessary to kill a human.
its market share was reduced to seven percent (Mitchell 1989).