Riluzole augmentation in treatment-refractory obsessive-compulsive disorder: a series of 13 cases, with long-term follow-up.

To the Editors:First-line treatments for obsessive-compulsive disorder (OCD)-cognitive-behavioral therapy and pharmacotherapy with selective serotonin reuptake inhibitors-producesignificant improvement in only about 60% of patients with OCD.1 Further symptomatic improvement can be achieved in approx