The speakers address assessment of hepatotoxicity in clinical trials from the prespective of the US Food and Drug Administration (FDA). As clinical studies and trials are generally powered for efficacy but not safety, monitoring for hepatic safety and adjudicating hepatic safety events are a mixture of art and science. Two experts with extensive knowledge regarding clinical drug hepatotoxicity discuss monitoring and adjudication approaches, and how the FDA evaluates for liver safety signals in new drug marketing applications.