title: Fentanyl: cumulative effects and development of short-term tolerance.
mesh_terms: D000700:Analgesics; D000818:Animals; D004361:Drug Tolerance; D005283:Fentanyl / Q000494:pharmacology*; D008297:Male; D051381:Rats; D013997:Time Factors
chemical_list: D000700:Analgesics; D005283:Fentanyl