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Journal of Pharmacokinetics and Biopharmaceutics

, Volume 23, Issue 6, pp 531–549 | Cite as

A pharmacokinetic-pharmacodynamic model of tolerance to morphine analgesia during infusion in rats

  • Dainèle M. -C. Ouellet
  • Gary M. Pollack
Article

Abstract

A pharmacokinetic-pharmacodynamic (PK-PD) model was constructed to describe the kinetics of tolerance development to morphine-induced antinociception. Tail-flick latencies in response to hot water (50°C) were assessed in male Sprague-Dawley rats exposed to a 12-hr iv infusion of either morphine (1.4 to 3.0 mg/kg per hr) or saline. Morphine-induced antinociception, expressed as the percentage of maximum possible response (%MPR), peaked after 120 min of infusion and decreased thereafter despite sustained systemic morphine concentrations. Both the rate and extent of tolerance development increased with increasing concentrations; an overall residual effect of approximately 24% MPR was observed at the end of the infusion regardless of the steady-state morphine concentration. The kinetics of tolerance offset were examined in a separate experiment by assessing tail-flick latency 15 min after morphine iv bolus (2 mg/kg) in tolerant and control rats. Recovery of response neared completion 18.5 days after a 12-hr exposure to morphine (2.0 mg/kg per hr). A PK-PD model was constructed to account for the delay in onset of antinociceptive effect and tolerance development relative to the blood concentration-time profile. According to this model, both the extent and the rate of tolerance development were modulated by the kinetics of the drug in the central compartment. Accumulation of a hypothetical “inhibitor” acting either as a reverse agonist, a competitive or noncompetitive antagonist, or a partial agonist could potentially account for the loss of pharmacologic effect in the presence of an agonist. The rate of tolerance development predicted from the PK-PD model varied widely (28-fold) depending on the type of pharmacologic interaction selected to account for the loss of effect. Using the rate of tolerance offset to discriminate between the different models (t1/2 offset 5.4 days), onset and offset of tolerance was described accurately by postulating that the inhibitor behaves as a partial agonist with low intrinsic activity (5.5% MPR) and high binding affinity for the receptor (IC50 15.0 ng/ml).

Key Words

pharmacokinetic-pharmacodynamic model tolerance morphine antinociception analgesia opiates 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Dainèle M. -C. Ouellet
    • 1
  • Gary M. Pollack
    • 1
  1. 1.Division of Pharmaceutics, School of PharmacyThe University of North Carolina at Chapel Hill

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