Abstract: The present invention provides methods and kits for treating obsessive-compulsive disorder, acute stress disorder, post traumatic stress disorder, social anxiety disorder, somatization disorder, specific social phobia, premenstrual dysphoric disorder, anxiety associated with a medical condition, adjustment disorder with anxious mood, dysthymia, specific phobia or fibromyalgia using a compound of Formula I or a pharmaceutically acceptable salt, optical isomer or prodrug thereof The present invention also provides compositions comprising a compound of Formula I or a pharmaceutically acceptable salt, optical isomer or prodrug thereof and an additional compound useful to treat the aforementioned conditions.