Class action lawsuits involve an individual or a group of individuals that share common legal issues for bringing a lawsuit for harm or wrong doing. This allows for one or more representatives to file suit for a class of people when the legal issue at hand is common to all members of the class and the number of people affected is so numerous that it becomes impractical to bring them all before the court. Class action lawsuits involving pharmaceutical litigation include groups of individuals that have been similarly harmed by a particular drug.