title: Disruptive effects of naloxone on development of morphine tolerance.
mesh_terms: D000698:Analgesia; D000818:Animals; D004361:Drug Tolerance; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors; D009270:Naloxone / Q000494:pharmacology*; D051381:Rats; D013997:Time Factors
chemical_list: D009270:Naloxone; D009020:Morphine