Jason Butler Harner Joins Showtime’s Possible Side Effects

Jason Butler Harner has joined the cast of Showtime’s drama pilot Possible Side Effects. The Tim Robbins’ drama revolves around the Hunt family, which runs a pharmaceutical firm. Harner will play the middle son, Silas, peacekeeper and perhaps the only sane member of the clan. Jason London originally was tapped for the role. The recasting was done after the table read for the pilot this week.