title: Opiate addiction and depression--cause or effect?
mesh_terms: D003866:Depressive Disorder / Q000150:complications* / Q000503:physiopathology; D004644:Emotions; D004723:Endorphins / Q000502:physiology; D006801:Humans; D009293:Opioid-Related Disorders / Q000150:complications* / Q000503:physiopathology / Q000523:psychology / Q000628:therapy
chemical_list: D004723:Endorphins