title: Can increased beta-endorphins explain the etiology of premenstrual syndrome?
mesh_terms: D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D004723:Endorphins / Q000502:physiology*; D005260:Female; D006801:Humans; D009270:Naloxone / Q000627:therapeutic use; D011293:Premenstrual Syndrome / Q000188:drug therapy / Q000209:etiology* / Q000503:physiopathology; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D009270:Naloxone; D001615:beta-Endorphin