Obsace ER 100 mg contains Fluvoxamine, which is an SSRI (Selective Serotonin Reuptake Inhibitor) in an extended-release (ER) formulation. It is primarily prescribed to treat Obsessive-Compulsive Disorder (OCD), helping to reduce unwanted, persistent thoughts and repetitive behaviors. It is also used to treat depression and social anxiety disorder. The medicine works by restoring the balance of serotonin, a natural chemical in the brain, which helps improve mood, sleep, and anxiety levels. The "ER" means the drug is released slowly into your body throughout the day. Please take this medication exactly as directed by your doctor.