Effect of D-Cycloserine on the Effect of Concentrated Exposure and Response Prevention in Difficult-to-Treat Obsessive-Compulsive Disorder

Key Points Question Does D-cycloserine potentiate the effect of concentrated exposure and response prevention in difficult-to-treat obsessive-compulsive disorder? Findings In this randomized clinical trial of 163 participants, D-cycloserine did not significantly affect treatment outcomes. Most patients responded to the concentrated exposure and response prevention treatment, and nearly 50% were recovered at 1-year follow-up. Meaning In this study, concentrated exposure and response prevention treatment was effective for patients with difficult-to-treat obsessive-compulsive disorder, but adding D-cycloserine did not potentiate the treatment.