Development of acute morphine tolerance in peripheral clinico-chemical parameters.

Changes in peripheral clinico-chemical parameters packed cell volume (PCV), hemoglobin (HGB), serum glucose, carbamide-nitrogen (CN), and creatinine were investigated in mice during the development of acute morphine tolerance. Acute morphine treatment (in drug-naive organism) altered the PCV, HGB, serum glucose and CN levels in a naloxone-reversible manner. Acute tolerance developed in PCV, HGB and CN values. The data raise the possibility of a relationship between clinico-chemical and pharmacological tolerance.