Evidence for sedative effects of low doses of morphine in mice involving receptors insensitive to naloxone.
D000818:Animals; D004305:Dose-Response Relationship, Drug; D008297:Male; D051379:Mice; D009020:Morphine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects*; D009270:Naloxone / Q000494:pharmacology*; D011957:Receptors, Opioid / Q000187:drug effects / Q000378:metabolism*
D011957:Receptors, Opioid; D009270:Naloxone; D009020:Morphine