Doctors appear to be aware of Tylenol's potential to cause severe liver damage according to a recent survey. Professors at the University of Michigan questioned 400 doctors on their knowledge of risks associated with acetaminophen, the active ingredient in Tylenol. Ninety-five percent were aware that acetaminophen could cause severe liver damage in an individual who consumes three alcoholic beverages a day. The survey, published in the June issue of the Journal of Clinical Outcomes Management, also found that the public is unaware of the dangers surrounding Tylenol misuse.