Studies on tolerance development to morphine: effect of the dose-interval on the development of single dose tolerance.
D000818:Animals; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance; D007279:Injections, Subcutaneous; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011930:Reaction Time; D013997:Time Factors
D009020:Morphine