Tolerance to the effect of morphine on intestinal transit.
D000818:Animals; D004361:Drug Tolerance; D005769:Gastrointestinal Motility / Q000187:drug effects*; D007421:Intestine, Small / Q000187:drug effects*; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D013997:Time Factors
D009020:Morphine