This funny, moving and perhaps surprisingly human play explores questions of sanity, neurology and the limits of medicine, alongside ideas of fate, loyalty and the inevitability of physical attraction. Connie and Tristan are falling head-over-heels in love—or is that just a side effect? As volunteers in a clinical trial for a new super-antidepressant, they can’t really be sure. As their sudden romance heats up, they’re left wondering if they can believe their own feelings, and their doctors are forced to consider the ethical consequences of their work. Winner of the UK Critics’ Circle Award for Best New Play, The Effect takes on our pill-popping culture with humor and scintillating drama.