Prozac By gkelly Jan 1, 1970 Discovering Fluoxetine Work Lilly started and would lead to prozac. Jan 1, 1972 Chemical Found Fluoxetine, primary chemical in prozac found. Jan 1, 1989 Joseph Wesbecker Killed eight people and was on prozac. Jan 1, 1994 Wesbecker Case Case settled and documents about the drug ruled to be released. Aug 1, 2001 Patent Lilly's patent expired.