Pilot Study of RR-HNK in OCD

This pilot study tests a compound called RR-HNK (a metabolite related to ketamine) delivered by infusion for people with obsessive-compulsive disorder (OCD) that has not responded to standard treatments. It aims to see whether this approach is safe and shows any early signs of benefit. **You may be eligible if...** - You are between 18 and 65 years old - You have been diagnosed with OCD - You have tried and failed at least one standard OCD treatment (such as an SRI medication or cognitive behavioral therapy), or have declined these for personal reasons - You are willing to fast before infusion sessions and follow study procedures **You may NOT be eligible if...** - You have an allergy or sensitivity to ketamine - You have a medical or psychiatric condition that makes participation unsafe - You are pregnant, breastfeeding, or able to become pregnant without using effective contraception Talk to your doctor to see if this trial is right for you.