Hydrocodone Bitartrate is the bitartrate salt form of hydrocodone, a semisynthetic hydrogenated codeine derivative and opioid agonist with analgesic and antitussive effects. Hydrocodone primarily binds to and activates the mu-opioid receptor in the central nervous system (CNS). This leads to analgesia, euphoria, respiratory depression, miosis, decreased gastrointestinal motility, cough suppression and physical dependence. Hydrocodone is converted to hydromorphone by the cytochrome P450 enzyme CYP2D6.NCI Thesaurus (NCIt)Narcotic analgesic related to CODEINE, but more potent and more addicting by weight. It is used also as cough suppressant.Medical Subject Headings (MeSH)