Study of Dextromethorphan in OCD and Related Disorders

This study tests whether dextromethorphan (an ingredient found in some cough medicines) can reduce symptoms in people with obsessive-compulsive disorder (OCD) or related conditions that involve excessive worry about body appearance or physical symptoms. **You may be eligible if...** - You have been diagnosed with OCD, body dysmorphic disorder, illness anxiety disorder, or somatic symptom disorder - You live in California - You are able to provide informed consent **You may NOT be eligible if...** - You have a current diagnosis of bipolar disorder or a psychotic disorder - You have a moderate or severe substance use problem (current or severe history) - You are pregnant or nursing - You are taking prescription psychiatric medications other than fluoxetine - You have recently started OCD-specific therapy (exposure and response prevention) within the past 2 months Talk to your doctor to see if this trial is right for you.