title: Decreased antinociceptive effect of morphine in rats treated intraventricularly with prostaglandin E1.
mesh_terms: D000698:Analgesia; D000818:Animals; D002552:Cerebral Ventricles; D004558:Electric Stimulation; D007267:Injections; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011453:Prostaglandins / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats
chemical_list: D011453:Prostaglandins; D009020:Morphine