title: Relationship to plasma meperidine levels to changes in anxiety and hostility.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D001007:Anxiety / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D006791:Hostility / Q000188:drug therapy*; D006801:Humans; D007258:Informed Consent; D007273:Injections, Intramuscular; D008297:Male; D008614:Meperidine / Q000097:blood* / Q000494:pharmacology / Q000627:therapeutic use; D008875:Middle Aged; D019966:Substance-Related Disorders
chemical_list: D008614:Meperidine