List of products in the National Drug Code with proprietary name . Buprenorphine is used to help relieve severe ongoing pain. Buprenorphine belongs to a class of drugs known as opioid analgesics. It works in the brain to change how your body feels and responds to pain. Do not use this medication to relieve pain that is mild or that will go away in a few days. This medication is not for occasional ("as needed") use.