Who I am Is not A side effect. Hearts and minds racing, Connie and Tristan are falling for each other fast. But is their sudden and intoxicating chemistry real, or a side effect of a new antidepressant? As two young volunteers in a clinical drug trial, their illicit romance poses startling dilemmas for the supervising doctors. Lucy Prebble's funny and intimate examination of love and ethics originally premiered in 2012, becoming an instant modern classic. This edition revised and updated edition is published to coincide with the production at the National Theatre, in August 2023.