[Acute tolerance to continuous subcutaneous infusion of morphine].
D000698:Analgesia; D000818:Animals; D004361:Drug Tolerance; D006339:Heart Rate / Q000187:drug effects; D007279:Injections, Subcutaneous; D008297:Male; D008614:Meperidine / Q000494:pharmacology; D008691:Methadone / Q000494:pharmacology; D051379:Mice; D009020:Morphine / Q000008:administration & dosage* / Q000494:pharmacology
D009020:Morphine; D008614:Meperidine; D008691:Methadone