title: Antagonistic action of tolazoline upon the analgesic effect of some morphine analogues.
mesh_terms: D000698:Analgesia; D000818:Animals; D004336:Drug Antagonism; D008614:Meperidine / Q000494:pharmacology*; D008691:Methadone / Q000494:pharmacology*; D009020:Morphine / Q000494:pharmacology*; D010620:Phenazocine / Q000494:pharmacology*; D051381:Rats; D014043:Tolazoline / Q000494:pharmacology*
chemical_list: D009020:Morphine; D008614:Meperidine; D014043:Tolazoline; D010620:Phenazocine; D008691:Methadone