Just this season of Chicago Med alone, Guy Lockard and Sarah Rafferty, who portrayed Dr. Dylan Scott and Dr. Pamela Blake, respectively, left the show. Upon their exits, co-showrunner Diane Frolov told Variety, “Right now, we’ve finished that arc of [Dr. Dylan Scott’s] story, so he is leaving right now, but we have people leave and we have them come back. We’re leaving that door open,”

Source: https://www.distractify.com/p/why-did-vanessa-taylor-leave-chicago-med