The Effect

The Effect
Written byLucy Prebble
CharactersConnie
Tristan
Dr. Lorna James
Dr. Toby Sealey
Date premiered1 November 2012 (2012-11-01)
Original languageEnglish
SubjectTwo people agree to volunteer in a clinical drug trial where they fall in love.
GenreRomance, drama

The Effect is a play by the British playwright Lucy Prebble. The story revolves around two protagonists, Connie and Tristan, who volunteer in a clinical drug trial, where they start to fall in love. Their relationship throws the trial off-course.

It received its premiere at the Royal National Theatre's Cottesloe Theatre in London in November 2012, and starred Billie Piper and Jonjo O'Neill. A revival production played at the National's Lyttelton Theatre in London in 2023, and later transferred to The Shed in New York City in 2024.